I have the PB10. I find it to be more than enough for my current needs. While most will suggest going with the 12 if you stick with JBL, my 10 does great service in a 12x17x8 room. To my ears it is both musical and very effective for HT. I think JandR.com still have this for $199 w/free shipping which is what I paid over a year ago.
Of course there's better out there but these PB's are a nice little package for the money.
I auditioned a PB-12 about 1 1/2 years ago. Put out a decent amount of bass, but distorts VERY easily, so you really need to be careful about not pushing it too hard. Good sub if you get it at a decent price.