I see on the forums that I haven't properly introduced myself; so here goes: HI EVERYBODY!!
I am here to get some hints and tips about upgrading my computer and making it more silent. and for a budget.

My current specs:

Zalman GS1000 Black Gaming, Alu,
ATX, 2x 120mm Fans Hot Swap (Without PSU)



Intel Core? i7 Quad Processor i7-920
4,8GT/sec, 8MB, Boxed

ASUS P6TD Deluxe, X58, Socket-1366
DDR3, ATX, SLI&CrossFireX, Firewire, 2xGbLAN, 3xPC

Chieftec Super Series PSU 650W Modulær
80 Plus, 140mm Fan, 4x SATA, 1x 6 pin PCIe, 1x 8 (

Corsair XMS3 DDR3 1600MHz 6GB CL9
Kit w/3x 2GB XMS3 modules, CL9-9-9-24, for Core i7

Gainward GeForce GTX 260 896MB PhysX
PCI-Express 2.0,"Golden Sample", DVI, native-HDMI,

Samsung SpinPoint F1 1TB SATA2
32MB 7200RPM

Lite-On Blu-Ray Reader IHOS104-37
Blu-Ray DVD-ROM, Sata, Bulk

Any ideas as how to make it more silent and how to make it more powerful?