well its ram only saves what u sample while the machine is on, but once u turn off the power all samples songs EVERYTHING is gone. Depending on how much u sample and as in how long ur chopped sample will be, u can save samples and sounds on the floppy disks. if ur sample is more then a certain amount of time it wont fit onto the disk so make sure u sample as little amount as possible, however if u dont wanna use floppies u can just save on the SCSI like mentioned above. mpcstuff.com has a video on it...
onlyupgrades u can do is:
Add effects board
add 8 out extension
SCSI Drive but this isnt really an upgrade just an added peice
and the RAM, 2 mbs to 32 Mbs
Thats pretty much it.
U can settle for that or save up the extra guap for an mpc 2500
I suggest getting the 2500 cause parts are gonna be hard to find for the 2000 soon especiialy the screen...but if u wanna start out on an mp, go for the 2000