I'd say somewhere between 15-20k. Who gives a shit about the windshield crack.
Only reason to trade a car or sell to carmax is if there's something wrong with the vehicle and you need to get it gone quick. I've done it a few times.
Probably not the most decent thing, but once was with a dealer who didn't want to give me a better price because "we're the best name in the area, the best cars, and you're not gonna find anything more convenient." Gave him a list of vehicles for trade, lowballed me on all of them, so I dumped some high viscosity fluid into the one with pretty bad rod knock that I was planning on parting out, and passed the problem on to them.
I digress. Your car is worth more than 8 grand.
