it depends which way you want to go if you want to go hardware you could check these peices of equipment out
1. mpc-series
2. asr-10( you can have you samples go across the whole board)
3. asr-x
4. motif( you get best of both worlds you get a sampler and a keyboard)
5. akia s2000
can't think of anymore hardware of the top of my head please feel free to add more
now if you want to go software check these out
1. E-MU EmulatorX Sampling System
2. reason 2.5( not for shure it has a sampler but i think so just ask the reason users)
3. fruity loops has a sampler to with auto chop function.
and i would also say get a turntable, start diging in crates at record stores, good will, and thrift stores.
well thats all i can think of write now please feel free to add more or change something if i got it wrong.