So many choices.. I can't widdle it down to one. Sorry.
Ferrari 360 Modena Spider (the convertible)
Shelby GT350/500 (the well-aged musclecar)
New Maybach (the luxury yacht)
BMW M5 (the sport-sedan)
TVR Tuscan Speed6 (the stunning beauty)
EDIT: Forgot the R34 Skyline (awesome toy)