The 2 above links are PF3000 pro's and a PFadvantage. One pro with a combine kit for $2,500. All new wireing for a new kit would cost you about $2,300. The other PRO has an integrated GPS with it for $1,500.
So a PF3000 without GPS just the display. Don't think $900 is too far off, but then again neither of these systems say "SOLD!" next to them either.