How much I'm willing to spend on a sub depends on what I can afford. My current (with absolutely NO intentions of upgrading) sub is an SVS 20-39pc+ that I purchased used for $550. I got raked on shipping though, so the total cost was about $725. $800-$1000 had been my absolute ceiling at the time, however. If I had the money to spend, sure, I'd spend close to $2K or more for an SVS Ultra 2 or something. It would have to really cut the mustard, though--real-world performance in my living room is all that matters. Period. Incidentally, I wouldn't even conceive of spending that kind of money if there weren't a serious trial period during which I could get full refund, no questions asked.