I got my LS400 for my dad as a grey import from japan, so I'm a fan of jap imports. If I was in your situation I would think about a 1996 or 1997 Toyota Chaser Tourer V or Mark II. You could get an auto imported for about 6500 pounds with 60000 miles. Performance is really amazing:
Maximum power: 206 kW @ 6,200 RPM
Torque: 376 Nm @ 2,400 RPM
0 to 100 km/h: 6.1 seconds
400m: 13.8 seconds
Weight: About 1,500 kg
Look at that torque figure. Have a look at them at this website: http://english.auto.vl(blocked word)/
They look much like what you would call a Camry, except better. If you sold both your cars you could get a manual, which are much more expensive, or a modified one, which have supercar performance, if 6.1 seconds isn't pretty much supercar already.