There is a Bag End Infrasub 18 for $895. That sub was a review winner many times for HT. Probably can't go wrong with that. With 40% open walls you will need the size as well.
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I think SVC makes great lower cost subs. A critical question, though, is if you are just going to be doing movies or will this be your TT/CD/SACD system as well? If you want it to do everything, I strongly recommend a sealed set of subs. Ported subs are just too slow, unless you want to do some serious modification. In my HT room I'm using a set of sealed subs and have found it a fair trade off to the one ported sub that is found in so many rooms. I do have a 15" sub in the garage/gym that is ported, but even there I had to modify the port and use a lot of Marigo speaker dots to get it to be listenable. I have to say, though, exercising to a 15" sub is motivational!
Is sub primarily going to be for music or HT? if for music I go with REL and not look back. REL is tight, fast and musical. good with HT but not great, unless you go with their higher offerings. I just ordered two REL t9's which houses two 10inch drivers and should fit the bill for my room and should do pretty well with HT.