help with pc build

Hi im building a pc for the first time. Im new to this stuff so i just want to get some input on my decisions. Whats good, whats bad and what i can do better..

Case: Power Up 5511 Silver ATX Mid-Tower Case with Clear Side, Front USB and Audio Ports and 450-Watt Power Supply

mobo: Asus M2N-SLI Deluxe nForce 570 SLI AMD Socket AM2 ATX Audio Dual Gigabit SATA 3Gb/s RAID Firewire (SLI Ready)

vid card: PNY VCG88GTS32XPB GeForce XLR8 8800GTS 320MB GDDR3 PCI-Express Video Car

memory: OCZ OCZ2G8002GK 2GB Kit DDR2-800 PC2-6400 Gold Gamer eXtreme XTC Edition Dual Channel Memory

cpu: AMD Athlon 64 X2 5600+ Windsor 2.8GHz 2 x 1MB L2 Cache Socket AM2 Processor

dvd burner: SONY 18X DVD+R 8X DVD+RW 8X DVD+R DL 18X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache E-IDE/ATAPI DVD Burner

HD: Western Digital Caviar SE16 WD2500KSRTL 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

Hi im building a pc for the first time. Im new to this stuff so i just want to get some input on my decisions. Whats good, whats bad and what i can do better..

Case: Power Up 5511 Silver ATX Mid-Tower Case with Clear Side, Front USB and Audio Ports and 450-Watt Power Supply

mobo: Asus M2N-SLI Deluxe nForce 570 SLI AMD Socket AM2 ATX Audio Dual Gigabit SATA 3Gb/s RAID Firewire (SLI Ready)

vid card: PNY VCG88GTS32XPB GeForce XLR8 8800GTS 320MB GDDR3 PCI-Express Video Car

memory: OCZ OCZ2G8002GK 2GB Kit DDR2-800 PC2-6400 Gold Gamer eXtreme XTC Edition Dual Channel Memory

cpu: AMD Athlon 64 X2 5600+ Windsor 2.8GHz 2 x 1MB L2 Cache Socket AM2 Processor

dvd burner: SONY 18X DVD+R 8X DVD+RW 8X DVD+R DL 18X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache E-IDE/ATAPI DVD Burner

HD: Western Digital Caviar SE16 WD2500KSRTL 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

Cepasa221

You need to get a new powersupply. Never go with the power supplies that come with cases. NEVER!

if your not getting two GPUs, you don't need an SLI mobo to keep cost down, this is a good one,

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128050

the 160 dollar version supports DDR 3 which isn't really needed if you want even more futureproof.