I am building a home theater in a 3rd floor full-size attic. The group I'm working with has recommended the AT4200 series, which is THX certified and around $3500-$4000 for a 5.1 system. Is it really worth the extra $1500-$2000 over the 2200 system? Does anyone have comments on this? Also, with my original speaker budget of $2000, what would someone recommend to couple with a DENON 2803 7.1 receiver and a DENON DVM-1815 DVD player? Paradigm, PSB, Athena? THANKS!!!!!