Best $20k Sport Coupe -- Used?

What's the best choice for a fun to drive coupe for $20k (not $23k or $25k but $20k really)? Must have a back seat suitable for real humans (5'10"). I'm assuming that an e46 M3 is the answer, but I wonder if that was a good car and if there is something better for the money?
by dieselhead on Sept. 13, 2010 - 8:06 a.m.