Since you are building this as an HTPC and a main rig, I'd STRONGLY suggest you change the following:
Cooler Master CM690 (or equivilant mid tower case of your choice)
DFI BloodIron / DFI DK P35
ATI HD3450 / 3850 / 3870 / 4850 (depends on what your budget is for GPU)
That will give you the RAW POWER you want as a main rig, and the GPU's I listed would be EXCELLENT for HTPC use....ANY of them. Its just that the higher you go on the GPU....the better you'll be able to game with it
. They will ALL do HDTV and Blu Ray just fine.
I would steer clear of AMD's side of the tracks for your build...based off the fact that you want it to be used as a main rig as well. If it was STRICTLY HTPC use ONLY...then I'd say go 45w AMD X2 CPU, and the 780g mobo with onboard GPU. But for a main rig as well....you'll want more horsepower than that