I am putting a home theater in a basement. I will be powering it with an older Denon 1800 for now. All my speakers will be wall mounted or on a shelf. The room will be about 15'X20'. I was looking at the Polk RTi A3, Def Tech SM450, and Energy CB-20. I would be building the system around these speakers with matching center and surrounds. I currently do have an older Def Tech 15" sub. Dose any one have input or thoughts on these speakers? I am trying to stay around $300 for the pair of fronts.