Fred Coulter
Collector of ancient keyboards
Okay, I'll be a counter heretic here.
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I have both an acoustic piano and a Casio keyboard. I like both, and use each for different reasons.
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• If you go the keyboard route, be sure to get one with 88 keys if your long term goal is to move to piano.
Which Casio do you own? My daughter has an 88 key Casio piano in her dorm. She finds it a great time saver rather than having to fight for practice room space. (She's still stuck in the practice rooms for the organ, but there's a lot less call for organ time so that's not a problem. Heck, the organ isn't even in the music building.)
I'd disagree on the 88 notes. The vast majority of piano music, especially the music played as a beginner, uses far less of the keyboard. If you can find a 61 note keyboard with weighted keys, it'll be enough for a few years as a beginner. I'm just not sure they make such a thing. This means that the OP would get by (and possibly save some money) if the OP looked at 73 and 76 note weighted keyboards as well as 88 note keyboards.
To make life even more interesting, Korg just released an 88 note keyboard that's not weighted. I wouldn't touch that thing with a ten foot pole, although others who aren't interested in actually playing piano might find it interesting. (It's also still very expensive and doesn't have aftertouch. I really don't see the point when comparing it to a stock Kronos 88.)