Does the cobalt only have door speakers? No 6x9's or anything in the back? I ask because you do not want to leave stock speakers going anywhere, and two 10" subs is way overkill to be matched up to just two door speakers.
For anyone putting together their first DIY car audio system, I usually recommend a good high-powered deck, a good matched set of speakers to replace all the stock ones (get the same model doors as rears), and a mono amp to power a single sub. If you get a good deck you don't need to power your speakers with an amp.
I've got an entire Alpine Type-R setup, 6.5/1" component set, 6x9s, and 10" sub, and amp. I run the speakers off deck power and they sound outstanding. The sub provides far more bass than I even want, I've got it turned way down; it easily overpowers the rest of the system. A box for two 10" subs, no matter how low profile, is going to seriously cut into your trunk space and there's nothing that sucks more than having to take them out to carry stuff around.
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