wrx's can easly run 12's on the stock block. there are plenty of guys on cos running vf39-20g turbos on stock block with over 100K on there motors. When it snows and your car has way to much tq to even hook up, I will be blowing by you with traction.
There is no way aftering owning a AWD car i would go back to FWD. When i had my monte it was faster then my stock wrx but the wrx was way more fun. I've got no doubt a cobalt turbo will be fast. Look at the SRT-4 its fast as shit with a couple mods. But its still FWD, It still won't own on snow like a wrx. You live in ohio snow is a fact of life.
Get a used wrx
toss exhaust/up/down/tune run mid-low 13's
Add a turbo to that setup and intercooler run mid - high 12's