I'm sort of in the same boat as you.
Looking to upgrade my receiver to get surround sound. I mainly play HD movies with DTS so it is important that I have all the latest decoders in my receiver. I am currently looking at the Panasonic VSX-819H-K.
Win 7 x64 Pro / MediaBrowser / Yammm / MCE-Yac / StarkCovers/ iMon
I7 860 / EVGA P55 FTW MOBO / EVGA GTX 285 / 8 GB G-Skill Memory
Thermaltake DH-102 HTPC Case w/ 7" LCD