I'm not going to recommend an MPC over the Triton - especially since you will be dropping alot of cash to pick either of these up. I've never used a Triton so I don't know how they are different - I'm just trying to open up your horizons - so you can explore for yourself.
I think alot of new hip-hop is using Triton's or sound modules and synthesizers, but MPC is still used alot.
Your best bet is to go to a music store and try both of them out and see which style of making beats you like - keyboard, or sampler. Do the same thing with mics and mixers and find out if they are good for you, and if so, what you want.
Also, if you just get a cheap keyboard now (oxygen 8 is pretty cheap), and a MIDI connection you could use Fruity Loops (or any other program) alot more effectively... alot less mouse clicking, and more intuitive music making.