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I have a Yamaha S80, which although it's a rompler it actually sounds really nice. 88 weighted keys (shit is heavy), lots of piano sounds, but also organs, strings, synths, etc and is 16-part multitimbral which would drone like crazy. Editing is sort of a pain to get used to, but actually not too bad once you get the hang of it. (for synths and drones, pianos don't need edits IMHO)

It was their flagship at the time of it's release (list price was like $4000) but can be had for used $200-300 now on Craigslist. Looks like people on ebay and reverb are trying to get $500-600.

Thanks for all the great suggestions!

Just some random thoughts while researching all the suggestions:
The Nord Electro 2 sounds great and seems to have a ton of great control (might be a little more than what I really need), but it will likely take me a while to find one.
The Hohner Pianet looks a bit more like a one trick pony, but it sounds amazing. Again, it would likely take me awhile to find one.
The Yamaha P115/P155 do exactly what I want and would likely be easier and cheaper for my to acquire.
The Yamaha Reface CP actually sounds pretty awesome and I kind of really want one for a portable/minimalist setup. I don't think the mini-keys and small range would really work out on a main instrument for me, though.
The Yamaha S80 and MX61 both sounds great, but probably have way more bells and whistles and extra modes/sounds than I really need at the moment.
I agree with Bartimaeus on the Korg SV1, it does seem a little more focused on organ/clav sounds, which isn't necessarily bad, but it's also not exactly what I'm looking for either.

I get what you're saying and understand your reasoning on the Pianet, I just wanna say that it's as much of a one-trick pony as a guitar or grand piano you know.

actualidiot wrote:I get what you're saying and understand your reasoning on the Pianet, I just wanna say that it's as much of a one-trick pony as a guitar or grand piano you know.

Yeah I didn't really mean that to sound negative. I would prefer something a little more simple without tons of extra modes and sounds. I am actually leaning towards the Pianet if I can find one around here.

I didn't read it as such It's obviously not super versatile and able to cop a bunch of sounds like a sample based keyboard, but like you said, the sounds it can do are pretty good. To me, there's also something about playing the real deal. I hope you find one.