I'm still continuing to piece together my HT and now i've come to the tower speakers. I have a large room about 25x30x10, and am having trouble deciding between the 35's and 5's. I am powering the mains with a yamaha rx-v1500. I am figuring that the main difference between the two models is bass response due to the 5's larger woofers, but I am most likely going to be investing in a svs pb-12/2isd or something similiar. So is it really neccesary to upgrade to the 5's? I would also appreciate any information on internet sites that sell klipsch tower speakers. I'm not weary about buying online and I like online prices alot better than in store prices. I'm just having trouble finding the towers online except for a few that are on ebay.