i for 1 have the 900, s950, s2000, s5000, mpc 60II w/3000 upgrades, mpc 2000, mpc 2000xl w/ mcd and the mpc 2000xl w 250 zip, and mpc 4000,
and i can tell you..no matter what bit rate you choose to use..it stills comes out to the way you want your samples to sound...a lower bit rate for grimey and gritty sounds..and a higher bit rate for crystal clear sounds....and i dissagree about the 900 and 950 being the same....because you have timestretch and other features that the 900 does not have..i often experiment with my s950 for the grimey jazz sample and the clear awesome drums on my mpc400 and i also make a nice long muffled bassline using my s5000 and the results are phenominal.
