whats are the best rims for a cobalt?

It's a matter of opinion

Go to www.tirerack.com to see them on your car.

www.andysautosport.com then click the car and go from there. This site may have some that tire rack doesn't have i'm not 100% sure

try discountedwheelwarehouse.com also

its not really a matter of opinion if your looking at the performance stand point. Idk if your running a SS or not but stay away from cheaply made heavy rims like american racing, flix,kosei,asa,ultra wheel, zinik. You really get what you pay for but if your just looking for something to slap on there that you think looks good it doesnt matter i guess. The best brands are Volk,gram light, bbs, ssr, ro_ja, work.

And just to be specific when I said the price of a set I was including tires cause what use a wheels without tires

not another wheel moron!!!!!!!!!!!!!! nobodt can answer that. its up to you.