I have a very good 10" sub. The 10" is very solid in my room, but I am looking to upgrade. Upgrade bug + disposable tax refund = new stuff (and jewelry for wife). Room is 15x17, plus a 10' opening to back. Basement room, concrete slab and carpet. Ceilings are 8'. Again, the 10" is doing fine. Just looking for some more thump and curious about the SVS'es. I am looking at the PB-10 and Pb-12. Is there anything that the 10 does better than the 12? I read the thread a month or two ago that dispelled the nature of smaller subs being "faster" and thus more accurate. So is bigger always better? Just get the biggest my budget allows?