Since the 4000 is the amp Im planning on, I was checking prices to make sure I get it the cheapest I can. Well I was at Music123.com and I saw the 4000 B-Stock was almost $100 cheaper than the non B-Stock. So whats this about B-Stock? BTW: Anyone who has that amp had problems with it? Im going to use a Carvin 2x10 with it, then Ill probably get a Mesa Boogie 2x10 and 15.