I have a 92 SVX.
I drive 2.5GT's all the time. (at work)
I have driven a WRX once.

Results...
The WRX is the quickest.
The SVX is the fastest.
The GT is back in 3rd. It has good balance (nimble and peppy) but isn't going to touch a SVX or WRX in its stock form.
I prefer my SVX, but for the money a new WRX is a true performance value.
My .02