Well, I just bought an SRT-6 and my dad has an '05 GTO 6 speed. The SRT seems just as quick, handles worlds better (the only other car I've driven that was as flat as the SRT through the corners was a Ford GT). The GTO's seats are better IMO, but the SRT wins on creature comforts/safety (dual zone HVAC, heated seats, Homelink, NAV, stability control, side airbags,BAS, TPMS). If you need more than 2 seats though there is only one answer...

Both cars have waay too expensive oil changes...