New Gaming Computer

Alright so I want to build a new gaming computer. But currently I am torn between two options one is a barbone kit from tiger direct that is lacking a video card. The other is a computer I have designed completely myself. Any suggestions on performance for price on either and any suggestions for other parts would be great.

My design

Antec 900 II case

http://www.memoryexpress.com/Produ [...] 0(ME).aspx

Intel core i7 920 processor

http://www.memoryexpress.com/Produ [...] 8(ME).aspx

Mother board either P6T

http://www.memoryexpress.com/Produ [...] 4(ME).aspx

Or

P6T Deluxe V2

http://www.memoryexpress.com/Produ [...] 9(ME).aspx

Muskin XP3 DDR3 Extreme memory

http://www.memoryexpress.com/Produ [...] 1(ME).aspx

Western Digital Caviar Black 640 gb

http://www.memoryexpress.com/Produ [...] 7(ME).aspx

XFX 4890

http://www.memoryexpress.com/Produ [...] 2(ME).aspx

Corsair 620 watt modular PSU

http://www.memoryexpress.com/Produ [...] 6(ME).aspx

Thats my design

Now these are the other two contenders

http://www.tigerdirect.ca/applicat [...] u=B69-1066

or

http://www.tigerdirect.ca/applicat [...] 9&csid=_21

In either of the barebones I plan to put the XFX 4890

My budget would be about $1500 with room to go up for more performance

The resolution would be 1920x1200

So any help with this descion would be helpful.

Ya I do think the 12 gigs is alot of overkill and I like the case I picked better