I'm going to be upgrading the receiver soon, and am going to have to choose between the following receivers, all of which I can get within my budget range. 1. Sony STR-DA4ES 2. Pioneer Elite VSX-45TX 3. Yamaha RX-V2300 4. Harmon Kardon AVR525 5. Onkyo TX-SR800 I'm currently leaning toward the Pioneer Elite because of the MCACC to calibrate for a poorly shaped room. However, I'm open to multiple opinions and just hoping to get some points of view that I may not have considered yet. They will be hooking up through Boston Acoustics Reference speakers. Thanks In Advance.