Most of what goes into making a good beat has more to do with you than your equiptment.
You can make high quality beats on expensive MPC's or cheap budget samplers.
You can make great beats with expensive software,or cheap software.
So keep that in mind before you put 25% of your college fund into equiptment.
I have extensivly used an mpc2000,Orion platinum,and a Zoom sampletrak.
They each have weak points,and strenghths,but the overall quality was about the same no matter what I used.
So Just do your research,and get what best suits your musical style,and budget.