i was thinking of that, but after driving a forrester xt, legacy gt, wrx (non wagon), sti, and evo. i found that the forrester, legacy and wrx were all pretty much the same performance wise, the wrx was a little more nimble, but suprisingly not much better than the forester, and the legacy was about equal, i actually think the legacy chassis and overall setup felt the best performance wise. and with the sti, for how much hype it gets its really not that great, the evo is much much better in every way hands down. i think with any of the other subaru's and some mod's you could easily get better handling and much better straight line speed for not much money.
so for me its either get the most fun awd car possible (evo) or get something thats a super sleeper, aka the legacy gt wagon or xt with lots of mods.