Try going to Autotrader.com and seeing what equivilant cars are going for. KBB is pretty good but the direct source is usually more accurate. If you can't find the right person, kidnap a stranger, brainwash them and make them the right person. Then do that a 100 million times and create a living zombie army to do your bidding.
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1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo
Warning: Objects in mirror aren't as fast as they thought they were.