Ok, so I had to look at the ad. I have to admit, $6k is pretty low. If that were my car, i'd be asking all of $8k too. Price depends on your area but I think $5k would be a steal, $6k would be a good deal, $7k you're a little high but nothing to cry about, $8k you're getting boned but SOMEONE will buy it if he holds out long enough. If he's not in a rush, he'll probably find a high dollar buyer. Or he'll part it out which is what he should do if he really wants to get 8.5k.
Maybe offer him something to trade as well as cash? Car looks sick IMO. If all the info is legit...
EDIT: And to take it a step further, after $7k, there's other cars I would much rather have than a Civic. I've always had a thing for swapped BMW E30's. I love just about any early to mid 90's import but the E30 pretty much takes the cake for me. There's plenty of CLEAN M5 swaps floating around the country for around 10k which IMO would be worth saving for.
.... anywayzzz