Dude...I have an MPC 1000 and an MV-8800 and I love them both but I think that Fruity Loops and a midi keyboard or any other controller is just fine.
I watched dudes on youtube handle fruity loops better than dudes with MPC's, MV's reason and so on....What i'm getting at is that one setup doesn't do anything more than the other. The only limitations are the ones that you personally have (you should already know that, as a beat maker).
Everyone loves swing but who needs a machine to control your swing when you can program drums without quantizing.
I would save your money and stick with what you got...If you use Fruity Loops properly, you don't need anything else.
However, if you really want to switch it wouldn't be a bad thing, but i don't think that it's necessary.
DK aka djkmann