350Z(used)
G35(used)
BRZ
FRS
Focus ST
2004 Cobra (used but the best investment of all of them)
You could ALMOST stick a newerish Mustang GT in there with the new 5.0 Coyote Motor and a 6 speed manual
But you'd probably need about 26-29 for a 2012/13ish model.
If you get a mustang, don't get a 2005-2010 models. Wait for the 2011+ with the 5.0 Coyote in them, trust me, you'll want to spend that little bit extra for 100 HP.