Need Suggestions For A New Computer

My first post Anyways, I was wondering if anyone could give me suggestions on my new comupter's build. So far, I've come up with

Case - ACT SK608 Mid Tower Case w/Front USB & Audio Ports
Power Supply - Cooler Master eXtreme Power 550W Power Supply
Motherboard - Gigabyte GA-EP45-UD3R - Intel P45 (Core 2 Duo/Quad) PCI-E Socket 775 Motherboard
Processor - Intel Core 2 Duo E8400 (3.0 GHz) Dual-Core Socket 775 Processor
Memory - Patriot Memory Extreme Performance Viper PC2-6400 Low Latency - 4.0GB Dual-Channel Kit
Memory (#2) - Patriot Memory Extreme Performance Viper PC2-6400 Low Latency - 4.0GB Dual-Channel Kit
Hard Drive - Seagate Barracuda 7200.12 ST3500418AS 500GB SATA II 16MB Cache 7200RPM Hard Drive - Single Platter
Optical Drive - Samsung SH-222A (Black) 22x IDE DVD±Writer *FREE Verbatim DVD+R 3-Pack* - OEM
Video Card - Sapphire Radeon HD 4870 1.0GB PCI-Express 2.0

Price: $964.55

For my processor, I also thought about a Quad core Q8200, but heard some bad things about the it, so i don't really know which is better.

If not a build-it-yourself one, how about a
http://www.futureshop.ca/catalog/p [...] 870&catid= ? (that one has a Q8200)
Price: $799.99

Thanks. :]