Keep an eye out on ebay as well. I picked up my Outlaw LFM-1 for 300 bucks last week. This model was discontinued but a great buy.
For what I have read the X-sub from av123 would be a great option for a room your size. Also go to HSU and look at the STF-2 or STF-3.
Yea, I bought a LFM-2 back in the spring, and then they discontinued the LFM-1 and expanded their line! I probably would have gotten the new 10" woofer model, or seen if I could have gotten a good deal on the original LFM-1 if I was buying now!
Oh well, I do love my little LFM-2 and would definitely recommend Outlaw subs as well as HSU's.
As for av123, I dunno, but that company seems highly disorganized to me and that puts me off from buying anything from them. I've been interested in their xls bookshelf speakers since the spring, but they keep putting off when they will be available. Since the beggining of May I have seen "available at the end of the month" every month since then (like for example at the beggining of July they said they would be available at the end of July, July ends and it changes to available at the end of August, and it's been like that since I started looking at them in April/May), in other words, they haven't been available since April or May. So they have been constantly backordered for months, and all the people on the forums there who have ordered those speakers have had to wait months to finally get their speakers or have canceled their orders, going all the way back to then. All the while the owner seems to spend all of his time coming up with new speaker designs that may or may not ever come out (I heard about the xls-ex back in the spring but have yet to see anything about its release date) or traveling around the country showing off speakers and taking pictures of "new finishes" of them at his factories, or posting on the forums, all instead of just working on fixing all of the delays with the existing lines of speakers his company produces. It's like they can't get their sh*t together!
No thanks, I'd stay far away from them, at least for awhile! I am!