Your room is just slightly larger than mine. My 10" is more than enough except on the absolute loudest LFE passages when I have a movie cranked pretty loud. If cost is a real concen, you might want to consider a quality 10" sub (HSU or SVS are highly toughted).
Oh, that's right you are looking forward for when you will be in a larger room. Ok, a 12" is better (unless you like the idea of 2 subs). HSU has a B-stock waiting list that gets you 20% off (new sub but a cosmetic blemish). That would put the price of a STF-3 at $480 or a VTF-3 at $560. Don't know how long it takes to bubble up to the top of the list. A call might give you an idea. SVS also has B-stock, but you have to check frequently as they list items till they sell and it changes daily (or even hourly). I have no idea how much they take off the MSRP.
Damn that seems cheap. Wish I knew that when I was looking.
Paul
