Integra VS Silvia: Integra, because it's a Honda, and Silvia's aren't that interesting to me.
Z4 VS TTS: TTS, because it's a TT.
Mustang VS Camaro: Mustang.
M1 VS XJ220: XJ220, because it's cooler.
M3 VS Focus RS: Focus RS, because it's a Focus, and it's more livable.
GT86 VS 370Z VS Cayman: Don't like the 370Z. I like the GT86 and the Cayman, but I'll go with the GT, because if I had a Cayman, I'd just be disappointed it wasn't a 911.
Cube VS xB: Cube, because it looks neat, and the Scion is awkwardly big these days.
M3 VS Cayman S: Cayman this time. M3s of that vintage just aren't that impressive to me.
Challenger VS Camaro: Camaro!
Civic VS Pulsar: Pulsar looks like a Walmart Clearance Sale ricer, so I'll take the Civic.
240Z VS 350Z: My fondness of the 350Z has worn by now. It's not that cool anymore, and the only Zs I see any more are poorly modified ones painted in ugly shades of purple. So, 240Z because I'd love to have on in real life.