I haven't used them but a lot of people praise them. I was pondering their SA series until a relative let me use his 12w7. I think the SA10 is like $150 new. Try looking at CL in your area. Even look out of your area. A lot of people are willing to ship and you can protect yourself by paying through paypal.
Edit: Sorry didn't see that you were looking at a 15.
Just let you know going loud isn't all about the size of the sub. you got make sure you have the right enclosure for the sub. I have heard 10's that got louder than 15's because the guy knew what he was doing.
