I haven't heard the PSB speakers, Alexandru, but your question about possible better alternatives below $1500 prompts me to ask if you and/or your spouse have looked at or heard Magneplanar speakers. There are two models in your price range, the MMG - which you can try out at home for 60 days free (except for the freight to return it if you don't like it) and the MG12. Both of them got what I call a "walks-on-water" review in the December 07 Absolute Sound. The MMG at $550 would allow you to get a pretty good subwoofer and still stay well under your $$ ceiling.
Possible problems: amp power (Maggies like a lot of current) and placement (at least two feet needed behind them and preferably more). But if I were in your shoes I'd sure take some of my favorite recordings to a Magneplanar dealer, or audition the MMGs at home. That's how they made a believer out of me and I'll bet the same goes for some of you reading this.