Ill sell you a nice fixed up Expert model.  $500 + ship
In all truth... Unless you're willing to fix one up yourself it is very hard to find a nice refurbished system.  I know from experience how much time and effort goes into repairing these.  Bottom line... It sucks.  You spend a bundle on a junk system and end up not being able to repair the floppy drives or find some mainboard fault you cant fix and boom there goes your $200 lol.  Ive gone through 20 or so systems and still have several.  Some of them are parts only because they cant be fixed.