Welcome! For coolers the thermalright ultra 120 is one of the best coolers out there while the arctic cooling freezer pro 7 is the best value at about 20 bucks.
There a corsair PSU that's on sale in our forum specials right now that is a great psu for a good price.
Here's a 500 GB Sata2 HD 7200 for only $106-
...and good luck with the e8400