What are Advantages/Disadvantages of MPC 1000 Vs MPC 2000XL

I am going to purchase an MPC in the next few weeks and am trying to decide between the 2000XL and the 1000. What are the differences in the two machines? Timestretching , swing , o.s. ??

Thanks in Advanced.

It's been covered so many times on the board. Why not searching for some answers. Really, there are plenty of infos, just have a look in the Comparison archives.