The TV should be fine, and I would go with the Onkyo TX-SR805, given its features/price ratio.
I would hold off on an HD-format type purchase. Things are heavily weighing in favor of Blu-ray right now, but that could change, or it might not change. I am inclined to believe that Blu-ray is going to continue to win more battles in this war, and if I had to pick right now I would pick Blu-ray. (not because I find them superior in any way, just that I think they will win the war given their present position)
Everything else seems to be in order.