Reason can't support VSTi's I think, but with Rewire it can act as a VSTi for other sequencers like Cubase but still can't support them. Why would you want VSTi's in Reason anyways?, it's a synth and sequencer made for that kind of job, if you want more sounds look at the ones on the Propellerhead's website, you can download them for free if you have a legal copy of Reason.
For your needs I'd be looking at something like an M-Audio Axiom (with pads) series or Oxygen series, or EMU Xboard series, or Korg MicroKontrol (with pads but the keys are smaller though).
For the drums it's basically up to you to try it out before you buy if you can, and see with which one you're more comfortable.
You're not gonna need balanced keys for what you're gonna do I think so don't look to much for those.
Everything is just basically trial and error until you find what's right for you.