I'm going to purchase a new receiver in the future and wanted some input on what features I should look for or are must haves. I know that some of these are personal preferences, but that's what I'm looking for. What do you guys look for in a receiver? Dolby Digital 6.1 Dolby Pro Logic II DTS (6.1?) EX I'm wondering if I should go with a 6.1 now since I won't use it for awhile even if I had it (no money for a new speaker. Also, what type of speaker is ideal for rear center or are they producing rear speakers now). Basically I want to know if I should go with the Pro Logic II and Dolby 6.1. I'm trying to keep the receiver under $500 if possible. Thanks in advance.