I thought I would start a thread on pawn shops picks because there are a lot of older boards and racks that are great sounding and can do as much performance wise as todays instruments case and point
the roland mks-20 still a very valid board although the pianos dont sound like real pianos and the EPs may not sound like real rhodes but the chorus is so warm and the pianos are so expressive they sound awesome and are still used today by top producers
price about 350-450 the fact that this board is twenty years old and still cost this much shows it is special
jv880 I paid 40.00

can be found for about 100.00-129.00
same basic sound engine though
this board is very warm and can be expanded with one srjv80
sound cards these sounds are still very relavent very very warm and lush
kurzweil micropiano
small half rack price about 200.00 pianos are ery expressive and nice
do they sound like todays latest piaon beast no but are they extremely playable in live setting?
newer stuff
the xr rack by roland is really the fantom and can accept up to 6 srx boards this rack can be had for about 600 the keyboard can be found for 800-1000
roland 5080
really just the xr rack only bigger
this is all have
but as a post script
boards I would look and racks I would consider are
any roland rack and any yamaha rack
but there are other companies out there like EMU Kawai
alesis nord
guitar center has a good used selection
and your local pawn shops should always be considered.
price