What I've got now is just an M-Audio Axiom 25, a fairly solid (if cheap) MIDI controller. 25 keys, 8 or so pads, knobs and wheels and all sorts of stuff. With that and my copy of Reason I can make competent bedroom music.
I don't know what I need, exactly. I'm still a novice with this stuff. I have no background in piano or keyboards. Basically what I do is fuck around with drum loops and sequencers (which come most naturally to me) and then hammer out remedial keyboard lines on top of those. That they're filtered through a program means that I need very little in the way of keyboard prowess to make sounds I like. I can stop the feed and go back and adjust with my mouse.
So I'm pretty wary about making the step to analog. It seems above my pay grade, honestly. The Rhodes sounds cool but the cheapest minimum bid on Ebay is around $600 and that seems like a big investment that might not pay off.
Basically I want 2 things out of my synth:
1. I want to have fun with it.
2. I want it to work with what I've got relatively easily.
If 1 is fulfilled then 2 is not terribly important. If I love the thing enough I will come up with a way to incorporate it into Reason somehow.