On a side note, for the track I use a 96 Impreza L gutted, caged, and looks like total crap, cause it's expendible, I can go hot into a corner with a guy with a Z06 in the rain and not worry about it one stich. For the street I run my SVX and 94 Legacy Turbo. I've tracked the SVX and the legacy turbo as well. The SVX was actually quite agile considering it's weight.
It's mostly driver skill when it comes down to it in the end. I would imagine the WRX and the LGT both are close enough in performance that the deciding factor would be driving skills really.
-mike