I know you say it must be a manual trans, but, what if there was a vehicle available in both rwd and awd format that was powered by a 420hp V8 and a 7 speed auto trans with flappy paddles? Interested?
Plenty of back seat in this sedan but specs of:
0-60 = 4.9 sec
1/4 mile = 13.7 sec @ 107 mph
Top speed = 157 mph and that's because of a governor.
Quickly sourced sample in your price range = 2011 w/ 127k asking $11.5k
That puts performance near some of these beasts which are older and may still be out of our price range.
2006 BMW M5
500-hp, 383 lb-ft. DOHC 5.0L V-10, 7-speed auto-clutch manual
0-60 mph in 4.4 sec.
1/4-mile in 12.7 sec. @ 114.6 mph
2007 Audi S6
435-hp, 398 lb-ft. DOHC 5.2L V-10, six-speed automatic
0-60 mph in 5.1 sec.
1/4-mile in 13.6 sec @ 104.4 mph
2007 Mercedes-Benz E63 AMG
507-hp, 465 lb-ft. DOHC 6.2L V-8
0-60 mph in 4.3 sec.
1/4-mile in 12.7 sec @ 113.0 mph
2008 Mercedes-Benz C63 AMG
451-hp, 443 lb-ft. DOHC 6.2L V-8, 7-speed automatic
0-60 mph in 4.1 sec.
1/4-mile in 12.5 sec. @ 113.5 mph
2008 BMW M3
414-hp, 295 lb-ft. DOHC 4.0L V-8, 6-speed manual
0-60 mph in 4.3 sec.
1/4-mile in 12.7 sec @ 111.3 mph
2008 Lexus IS F
416-hp, 371 lb-ft. DOHC 5.0L V-8
0-60 mph in 4.3 sec.
1/4-mile in 12.7 sec. @ 113.4 mph