You can buy a Tuniq Tower 120, it fits most of the cpu sockets, including 775 and it's a very good deal on price/performance. It's very quiet, i can tell you this since i own one. If you want to make it completely silent switch the tuniq fan for a S-flex or a Noctua. You can mount it any way you think it's best, to blow air from front to back in a push-pull setup, or from bottom to top exhaust. There are a couple other coolers with side-blown depending on cpu and budget, like Arctic Freezer Pro 7.