I have a 5.1 setup consisting of the infinity Beta 50bk and 10bks, for front and surround, a PS12BK sub and a beta center channel. Up until now, my roommate and I had been using his HK AVR230 receiver. Since he is now moving out, I am looking into buying my own receiver. I want to stick with HK, because I can get them for pretty cheap. Should I stick with the AVR230, or go with an AVR335, or an AVR430?