Perhaps I'm blind but I believe you didn't actually mention 'PC-gaming' as a specific requirement of this rig, just that you want to hook your Wii to it and stuff.
If you don't intend to do any intense PC-gaming on it, you don't need a beef video card. But I'm sure you do, because you mentioned an 8800GTX.
Yes, Intel plans to slash prices soon. If you're not in a hurry, wait until Christmas. The G92 is planned for launch (along with the R700, although I wouldn't bet on that one coming out on time). Intel's 45nm Core 2 shrink 'Penryn' should also be out too. DDR3 prices should come down and super-large LCDs should further depreciate in price.
Here's what I'm planning for Christmas:
Penryn
4GB DDR2/3
G92
X-Fi
24" Dell
Best thing is, it won't even cost me more than ~$3000 and it should woop the gaming capabilities of a system I could build now for that price.