$800 Moderate Gaming PC

Hi, guys! I'm new to building PCs and I need your expertise on this. I tried to pick out parts that are compatible and what not, but I'm not sure if they are. Any advice/suggestions would be appreciated as well!

APPROXIMATE PURCHASE DATE: The next week or two.
BUDGET RANGE: After rebates: $800.

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Surfing the net, gaming, writing essays, listening to music

PARTS NOT REQUIRED: mouse, speakers

PREFERRED WEBSITE(S) FOR PARTS: newegg.com

PARTS PREFERENCES: Intel CPU

OVERCLOCKING: Maybe SLI OR CROSSFIRE: No

MONITOR RESOLUTION: none preferred

ADDITIONAL COMMENTS:

Here are the parts

GIGABYTE GA-EP43-UD3L LGA 775 Intel P43 ATX Intel Motherboard - Retail

Intel Core 2 Duo E7400 Wolfdale 2.8GHz 3MB L2 Cache LGA 775 65W Dual-Core Processor - Retail

Western Digital Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM

G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL4D-4GBPI-B - Retail

HIS H485QT512P Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported IceQ4 Turbo Video Card - Retail

CORSAIR CMPSU-400CX 400W ATX12V V2.2 80 PLUS Certified Compatible with Core i7 Power Supply - Retail

COOLER MASTER Centurion 534 RC-534-SKN2-GP Black / Silver Aluminum & Mesh bezel / SECC Chassis ATX Mid Tower Computer Case - Retail

ASUS VH236H Black 23" 2ms(GTG) HDMI Widescreen Full HD 1080P LCD Monitor 300 cd/m2 20000 :1 (ASCR) Built in Speakers - Retail

LITE-ON Black 24X DVD+R 8X DVD+RW 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA CD/DVD Burner - Retail

Zonet ZEW2500P IEEE 802.11b/g MINI USB / USB 2.0 Wireless Adapter Up to 54Mbps Wireless Data Rates 64/128-Bit WEP, WPA - Retail

I also have some questions. Will that last item allow me to access my wireless internet at home? Also, will the psu I picked out power the whole thing? Thanks for your time guys!

An 1556 will cost you a bit more but its worth it in the long run. However if your on a very strict budget I see nothing wrong with this build with a few changes.

Ditch the HIS 4850. XFX 4850 has a much better warranty for the same price. You will also want to get a 550W PSU as its recommended by your parts.

Thanks for the input guys. I would love to have an i5 build, but I'm trying to keep everything, including the monitor, lower than ~$850. As for the psu, I thought a 400w psu would according to How Much Power Does Your Graphics Card Need?. Just trying to keep the money as low as I can, but if you think I should really get a stronger psu, then that could be arranged, I suppose. Thanks again!