The '08s with the turbo aren't even available yet. They won't be out till probably mid-year.
Anyway, lots of cars, even new ones, can be had for 15k. Just pick something and run with it.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne