Are you not considering the Octatrack?
If I were in your boat it would be the Octatrack over the MPC1000.
I've owned both and sold the MPC1000 as the workflow didn't really gel with me. I find the OT more immediate due to the x0x style sequencer.
The Octatrack + Goldbaby Samples = the only drum machine you'll ever need (if you don't want to synthesize your own hits
)