Never heard of that Heatsink brand. Poor reviews as well. I'd go with this; its what I have and a warning it's huge

http://www.newegg.com/Product/Produc...herm%20Nirvana

And for a case i'd go with this or the 900 series if you have the cash and need a large case.

http://www.newegg.com/Product/Produc...pk=Antec%20300

And 4 Gigs should be enough, I only 2 Box and have no issues with 4 gigs. May go to 8 gigs for other reasons. Otherwise I don't know much about AMD anymore, haven't looked into them seriously since I built my old Socket 754 AMD 64 3000+ system like 4 years ago.