$700.
Rev A has KNOWN heat issues and while not all affected, many many were.
The line has since seen 2 other revisions. The guy standing strong on going no more than $200 under refurb is silly. Ask him if it's ever been repaired and the fact that there's no box or anything I would not offer over $700.
...I know people aren't crazy about netbooks due to the "power" of them but when I look at people who have MBA's (especially rev A units) and I pull out my $300 eeePC and don't have to plug in a USB hub, etc... to be productive with it on the go I just sort of laugh...
The 13" uMB/MBP's with the current pricing and "real" GPU = that would have made me re-think getting a netbook over a year ago...