In my opinion the WRX is the clear winner in this case, cobalt SS vs WRX. Subie offers AWD in which I could find usefull in many situations (Winter). Plus it out powers it by almost 10 HP. Granted its a couple of thousand more, but thats not alot to pay for an all season car as the cobalt sits still in the snow.
In the styling dept. The cobalt SS still looks plastic to me. Its unchanged, and resembles the regular cobalt minus the wing. The WRX on the other hand looks more refined. a sedan on steroids.
If this were my choice Id go WRX !
The EVO X I think is even better looking, and can match the power of the WRX. also offers AWD.
WRX
The EVO X

Clearly better looking. More aggressive.
This would be my choice after MODS !
WE ARE TALKING 09 RIGHT ? I saw you posted stats on the 08 vs.