WELCOME
??? Budget? $4300 for receiver & speakers? 5/7.1? Sound like a nice HT setup you're putting together. Hope we can help.
For $4,300, I would definitely get a pair of the Definitive Technology BP7001SC, 3 of the DefTech SM450, and the Onkyo TX-SR805.
My BP7000SC + SM450 filled my 20 feet x 40 feet HT with EASE! Each of the BP7001SC has a built-in 1,500-Watts RMS 10-inch Subwoofer! So two of them would equal a total of 3,000-Watts RMS of SUBWOOFER! These DefTechs beg for the kind of room size that we have. Each of the SM450 has a passive 10-inch Subwoofer! So your Center and Surround speakers will be VERY bass happy. Read the reviews.
But from my experience, the DefTech SuperTowers are the best. Because of them, I now truly love both music and movies.
The Onkyo 805 seems to have enough power, purity, and features you need. It's THX-Ultra Certified. It has 2 HDMI. It can decode Dolby TruHD and DTS-HD MA. Personally I would go for the upcoming Denon 2808, 3808, or 4308, but they are out of your stated price range.
Have fun!!!!