70’s era prog rock band types of style music and I am in the market for a strong keyboard /synth that can produce good organ , moog , EP, etc all the staples of the genre
There are a number of issues to think about.
Some boards are really good at one of these things, less good at others. Boards that are really good at all of them are, as you might expect, pricier. You could also get a pair of boards, each better at some things.
Piano is another staple of the music, I don't know if that matters to you, but pianos (even more so than the EPs you mentioned) play best from hammer actions, which are worst for organs... so if you really want just one board, you want to look for either one of the hammer action boards that aren't
too bad for organ, or one of the organ friendlier feeling boards that are not
too bad for piano.
Besides particular kinds of sounds, prog music often involves playing multiple sounds simultaneously (e.g. different sound on left and right hand, like a Moog lead over a Hammond organ), and/or switching rapidly among multiple sounds. This means either arranging splits on the keyboard (and making sure you have enough keys for each sound when you need it, and probably taking the time to set these things up in advance), or, again, possibly using multiple keyboards. Trying to do everything on a single 61-key board will take some setup effort and compromise, I suspect, but you could start there, and maybe add another board later.
Things I think you might want to look at, sticking with your preference for 61, and focusing on the sounds you mentioned (organ, EP, moog, by which I'll be talking about just analog-synthy kinds of sounds in general)
Yamaha YC61 - strong organ, strong EP, maybe passable moog (limited number of synth sounds in it, with limited editing available). Above average ease of use. You can combine up to 3 sounds at a time (but then 1 must be an organ, and there's only a single split point).
Yamaha MODX6 - okay organ, okay EP, ok moog... none of those are the board's strongest sounds, but none of them are too weak, and the board is extremely flexible (e.g. in terms of editing sounds, or setting up splits/layers). You can combine up to 8 sounds at a time. You can also load custom samples into it.
(Aside - The MX you asked about is weaker than MODX for organ, weaker for EP, and you have to use a 3rd-party editor if you want to edit sounds or assemble combinations of more than two sounds. The Juno DS you asked about has an advantage over the MX in that you can do the sound editing and 3+combination assembly on the board itself, but I'd say that its action is probably worse, and the sounds of interest are probably no better, and I think possibly weaker, though there's always some subjectivity to that. Unlike the MX, it does have some ability to load custom samples, though. Regardless, since you have a better budget, I'd have a hard time recommending either of these since I think you can get something with more strengths and/or fewer weaknesses for the sounds at hand.)
Roland VR-09B you asked about - strong organ, weakish EP, good moog. Most synth editing needs to be done via an outboard editor (Roland's is an iPad app, there's also a freeware editor for Mac/Windows). Easy to use. Limited effects (i.e. you can't put different effects on different sounds at the same time). Below average action, especially for piano. Not really geared to play more than 2 sounds at a time (though you can get around that with the freeware editor). Quick patch changes can be a little awkward, since there are only 4 dedicated patch change buttons.
Roland Fantom-06 - strong organ, weakish EP, good moog (better than VR-09B).. But unlike the VR-09B, there's full editing on board, you can play up to 16 sounds at a time, each with their own effects. Very flexible, and I'd say easier to use than MODX. You can also load custom samples into it. (There's also the full Fantom 6 which is nicer... better feeling keys, more real-time controls, among other things, but quite a bit pricier, and heavier).
Korg Nautilus - basically, pretty strong at everything. Another one you can also load custom samples into.
Vox Continental - okay organ, strong EPs, maybe ok moog (limited number of synth sounds in it, with limited editing available... tough probably more "analog sounding" than the YC61 which I described the same way). One of my favorite actions. But almost no split capability, and again, only 4 dedicated patch change buttons.
Hammond SK Pro - probably strongest organ, fair-to-okay EP, good moog. A bit more complicated to navigate than it should be.
Kurzweil and Nord have some good options, but any of the models I'd recommend have at least 73 keys.
Being able to seamlessly switch from one sound to another (ie, without a held/decaying note or its effect being cutoff when you switch to the next sound) is a nice feature. They can all do this to some extent (Hammond weakest here, I think), but there are different caveats.
If a board works for you except for some particular sounds, you can consider supplementing with a small external device. A Roland Boutique module can give you great synth sounds (their SE-02 specifically mimics a Minimoog nicely). There are all kinds of sounds you can add via a small iPad or iPhone. If this interest you, then some other factors include what MIDI capabilities are in the board, and whether the board may have space for you to place the device, which is a nice convenience. Except for the Vox, all of the boards I suggested considering allow you to use their own patch change buttons to call up sounds that reside externally. Integrating internal and external sounds is easiest on the MODX.
p.s. - Based on the music you're talking about, mellotron might be another sound of interest.