12' x 20' x 7.5' (or more) = at least 1,800 cu.ft. That's big enough that I wouldn't buy an 8" sub or an ineffective 10" sub. The Energy S10.3 is a great sub for the money. If your situation permits, you could wait for the next time it's on sale for ~$200 incl. shipping, have it delivered to Ogdensburg, and drive down to pick it up.
Aside from that, the $150 PDR-10 you linked to would be a pretty good way to go, too.
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