If you're going to Auto-x for sure, I'd actually opt for a RWD car, but between the G20 and the Teg, go with the Teg. G20 is heavier; you want light, plus there are WAY more parts for Integras. Most any strut tower bar will work up front. I'd go for the R bar over the GSR one, but it definitely costs more. Rear swaybar is a must - go with the Comptech one; it is the best kit I've seen. I did th ITR sway on my former GSR and it worked out really well, probably the best single upgrade I did on it handling wise.

I don't know about on a Teg, but I have AGXs w/ Pro Kits on my 240SX and I'm really happy with it. The shocks allow for just the right amount of tuning front to rear, and allow you to quickly switch between really stiff for Auto-x and a little softer for the daily commute (if you want, I leave it tight even for the street). The springs give just enough stiffness while maintaining a good ride on the street.