Lexus and volvo are both beyond my reach. So, I really never look into them carefully. I hate to mislead you. I would let other brothers to make comments on this issue.
for the Corolla, I think you can get more money back if you sell it in private. In most cases, trade-in usually is another word for being ripped off by dealer.:) you can look into your local newspaper classified ads for price info. edmunds.com and KBB.com are both great resources too.
good luck