Which system to purchase?

I would like to purchase either of these two systems and am looking for feedback on which system would better suit my needs. I want a system that I can continue to upgrade in the next few years. I will be playing games but I value savings over maxed out graphics. I am able to modify the hardware so suggestions welcome:AMD:CPU AMD Phenom II X2 550 Dual-Core BE 3.1GHz 80W 45nm 7MB
CPU Cooling AMD AM2/AM2+/AM3 Stock CPU Cooler
Memory 1 OCZ Plat 4GB Kit DDR3-1600 (OCZ3P16004GK)
Motherboard Gigabyte GA-MA790XT-UD4P (2PCI-E,4DDR3,1394,RAID)
Hard Drive 1 WD Caviar Green 1TB 7200RPM 8MB SATA (WD10EAVS)Optical Drive 1 LG 22X GH22LP20 DVD+/-RW DL,LightScribe,IDE (Black)
Video Sapphire Radeon HD 4870 512MB DDR5 PCI-E
Case Standard ATX 5019 Case (Beige)
Power Supply Corsair TX750W 750W ATX 12V 60A 24PIN ATX PFC 14CM Fan
Networking 1 TP-LINK TL-WN353G 54M Wireless G PCI Adapter
COST = 885 CDNLink: http://www.etccomputer.ca/eShop/default.asp?selection=system%26systemid=6328INTEL:CPU Intel Core i7-920 Quad Core 2.66GHz,8MB,4.8GT/s,Tri-Channel
CPU Cooler Intel Core i7 Original Socket 1366 Stock CPU Cooler
Memory 1 Kingston 3X2GB Kit PC3-10666 1333MHz (KVR1333D3N9K3/6G)
Motherboard MSI X58 Pro-E (3PCI-E,CF,SLI,6DDR3,RAID,1394,GbLAN)
Hard Drive 1 WD Caviar Black 500GB 7200RPM 32MB (WD50001AALS)
Optical Drive 1 LG 22X GH22NS50 Multi Security DVD Rewriter SATA(Black)
Video Card 1 Sapphire Radeon HD 4870 512MB DDR5 PCI-E
Case Standard ATX 5019 Case (Beige)
Power Supply OCZ 600 Watt StealthXStream (OCZ600SXS)
Networking 1 TP-LINK TL-WN353G 54M Wireless G PCI AdapterCOST = 1,090 CDN
Link: http://www.etccomputer.ca/eShop/default.asp?selection=system%26cartsysid=0Which system to purchase?
The Intel system