If i had to buy an import sports car here are the vehicles i'd probably buy:
European:
Porsche 928 (RWD, front engine, 50/50 weight, etc. - The DOHC 5.0L V8 from i think '87+)
Any M-series BMW...they're all really nice
Either the new 911 Carrera Turbo 4, or the (i think) 977, which is so fast and emissions bad that it's illegal in the united states to import.
Japanese:
Toyota Supra Twin Turbo
Nissan 300zx twin turbo
Mitsubishi 3000GT twin turbo (notice a theme yet)
Honda S2000
...i might also add that if you look closely you'll notice ALL of the vehicles i selected are either rear wheel drive or all wheel drive.
This also is in no way a reflection of cars that i could AFFORD...but you never mentioned that in the post

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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem
1985
Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04

1989
Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)