Without a doubt I'd buy a late model C5 Corvette, a Z06.
That's 0-60 in
3.9 seconds, all the toys, over 30 to the gallon on a run, about 25 to the gallon combined, cheap servicing (with long intervals, only needing plugs, fluids and filters), and cheap insurance. Rare too - not often you'll see another on the road or park next to one - and has that 'wow' factor for passers-by (i.e. isn't just another bland Jap coupe or invisible German saloon with big alloys).
Some facts & figures:
Power output: 405BHP at 6000RPM
Rev limit: 6500RPM
Torque: 400ft.lb at 4800RPM
Top speed: 186MPH
0-60MPH: 3.9 seconds
0-100MPH: 9.2 seconds
0-100-0: 13.56 seconds
Skid pad G: 1.03G
Standing ¼ mile: 12.4 seconds
MPG: 20/30MPG (city/highway, UK MPG – EPA official measurements)
Length: 4564mm
Width: 1869mm
Nürburgring Nordschleife lap time: 7 minutes 56 seconds
Wipes the floor with most European stuff, especially in terms of running costs. It also doesn't skimp in the equipment department like some do - it has excellent air conditioning, a heads-up display, active handling with adjustable performance and damping settings, cruise control, stability control, an LSD, traction control, ABS, electrically adjustable everything and a great 6 speed box.
They are very easy cars to not only live with, but drive, on a daily basis - just as happy loping along in the pouring rain on the motorway doing 1800RPM at 70, as they are doing 6500RPM in 3rd down narrow country lanes - and you don't need some expensive specialist to do the work on it.
Get a real nice one with about 30k on it for 16k....plenty of change to do silly things to it then!