Hahaha. I'd go with number 1, you could probably buy 2 or 3 GTSt's with what you'd end up spending to make your car go like one.
Are you sick of getting beaten by your mates' GTSt, and want revenge or something? Bear in mind power isn't everything, the GTSt's are heavy bastards, but have torque for Africa, coupled with the fact that 99% of GTSt's have at least an exhaust/pod filter, giving them another few hp.. whereas 4ages aren't exactly torquey, but are usually in much lighter cars..
Seriously, if you want to beat a GTSt down the quarter mile, one option would be to totally strip your car, spend $5000- $6000 either turbo'ing it or making it rev to 10,000rpm.. or just sell your car, buy a GTSt for $4000, spend a couple of grand on an exhaust/pod, wind a bit more boost into it, and you're done.
I can honestly say, having owned several turbo Nissans, and plenty of Toyota's, I'd take a Nissan anyday, hence why I have one now!

Daily driver: Toyota RunX/Toyota Caldina
Ex: 2x AE101, 5x KP60, KP61, EP71, 3x KE70, KE72, AE70, AE82, 2x TE71, AE90, AE92, ST170, plus 11 Hondas, 12 Nissans, 6 Fords, 4 Mazdas, 3 Mitsis, an Isuzu and a Lada!
