I guess that's ok, since you got that motherboard already. And like Siddanth asked. Can you show a link of the motherboard you got?....because I can't find it.
You don't need to buy a different HSF, if you're not overclocking. But I know Prescotts run hot. So if you don't mind, you can get an Arctic Cooling Freezer 7 Pro for $19.99 at svc.com:
Arctic Cooling Freezer 7 Pro CPU Cooler for LGA775
....wow last time I saw this at svc.com, it was $23.99
I would suggest this case instead:
Newegg.com - COOLER MASTER Centurion 5 CAC-T05-WW Black/Silver Aluminum Bezel, SECC Chassis ATX Mid Tower Computer Case - Retail
The case you picked, doesn't have any fans included. This one does.
And if you're in the US, buy from newegg.com....Their service is far better than tigerdirect.