Hmmm, I had Kronos an Phantom, both keyboards in my Studio for couple weeks but I did return them both! Then I got a MONTAGE, the sound much superior in any aspect! I'm thinking to get the Nautilus 'couse has 16 Audio tracks beside 16 Midi tracks, you can record mics an guitar, Bass guitar, etc... on Audio tracks, use the Nautilus keyboard as a recorder.
Kronos can do all that same recording stuff. If you didn't like the Kronos, I'm not sure you'd care for a Nautilus which is, in most respects, just a scaled down Kronos (though with some new sounds, and a more typical kind of arpeggiator instead of Karma).
Have you played a MODX?
If you have next time you are in a Music Store have a play of a Roland FA, if you do not find the Roland vastly superior then you are alost cause.
I really disagree with that. Each has some notable advantages over the other (see post #74 in this thread). Expanding on what I said there, I mentioned that I think the MODX sounds better for most acoustic instruments. Technically, this is probably why:
The vast majority of non-synth sounds you'll hear when you play the FA in a music store (all but the small handful of "SuperNATURAL Acoustic" tones) are from the 20+ year old 64 mb soundset of the XV-5080 (though you can also add 128 mb of SRX-based sounds). By comparison, the MODX has a 5.67 GB soundset out of the box (plus a gigabyte of space for user or 3rd-party samples). And those Roland sampled sounds are limited to a max of 4 samples per key (layered, or velocity switched) whereas on the Yamaha, it's up to 8 samples per key for a single part sound, and you can go beyond that using multi-part sounds, and you can also assign some of those samples to function as alternate articulations in addition to the layering and velocity switching options, which I don't think you can do on the Roland. Specs like this aren't everything, there are great sounds to be found in boards that don't look so impresisve on paper, and there are certainly some very nice sounds in the Roland too, but to the extent that I think the Yamaha often sounds better, these specs probably help explain why!
Outside of sample-based sounds, it's true that the Yamaha does not include a VA synthesis engine like the Roland, but OTOH, the FA does not include an FM synthesis engine like the Yamaha.
As for those Roland SuperNATURAL Acoustic tones, as mentioned earlier, they are piano, EPs, clav, basses, acoustic guitar, and ensemble strings plus the clonewheel organ... but despite these being the more advanced Roland acoustic sounds (employing modeling), I think the Yamaha even generally sounds better for most if not all of these sounds as well. Though these things obviously can also be somewhat subjective. (e.g. not everyone agrees as to whether Roland or Yamaha pianos sound better). But I found the EPs and clonewheel organ on the FA to be particularly underwhelming, for example, and prefer those on the MODX (though MODX would not be my first choice for EP or organ either).
I also generally prefer the MODX actions, though neither series has top-notch actions.
FA is by no means a bad board, but there's no way I'd consider anyone who didn't find it "vastly superior" to the MODX to be a lost cause!