You'll probably be pretty far upside down on your civic. KBB says 18k, so I bet a dealer would offer you 16k or less. Are you planning on trading or selling outright? you can trade in with negative equity, but the value of the car you buy can only be borrowed against up to about 120%. At that point your really pinning yourself in a corner if you bought the ST and then decided you didn't want it. I'd pay it down a bit more and look when you are breaking even on the civic. It sucks now, but your pocket book will thank you later. There will always be something out there that you want.