if its in good shape, i think 500 is a fair price. Especially if your control panel overlay is in good shape.. that damn thing was a NIGHTMARE to find.
heck, I'd really rather have a big red or at least an 4 slot v1 cab. But whatever makes you happy. I think just a regular 2 slot cab is worth $300-$400 plain. If it's in excellent condition and with games a littl more. .