This has had me thinking for a while and it's come to the following...
The current - Alpina D3 Coupe.
214bhp and 332lb-ft torque
42mpg
Pretty limited numbers, yet completely bulletproof... seats 4 with plenty of space, rear seats also split and the boot is huge. Servicing every 18k miles and they don't cost the earth... only expensive part seemingly tyres.
Handles great and overall Great value!