The 8800gts is a beast but in 4-5 years its not even going to be comparble to how a 6200le is now (and im basing that on a linear graph of technology and not exponentially like moore's law states).
Both your links are for the same mobo, but i wouldn't get that chipset for the conroes. The only chipset i trust for the C2D's and sli are the 680i. You can get the evga 680i
for $250. If you know you won't sli then a gigabyte ds3 or asus p5b deluxe are great.
edit: WD and seagate both make good hard drives (except for that time when seagate used maxtor parts when they bought them out
). I use 2 WD 250's and one seagate 400gb.