For a gaming build i would go with a i5 750 like this
quantity of item 1
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRH
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRH - Retail
Item #: N82E16820231279
Return Policy: Memory Standard Return Policy
$139.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231279
select item 2 quantity of item 2
ASUS P7P55D-E Pro LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
ASUS P7P55D-E Pro LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel Motherboard - Retail
Item #: N82E16813131621
Return Policy: Limited Replacement Only Return Policy
$189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131621
select item 3 quantity of item 3
Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor Model BX80605I5750
Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor Model BX80605I5750 - Retail
Item #: N82E16819115215
Return Policy: CPU Replacement Only Return Policy
-$5.00 Instant
$199.99
$194.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115215
Subtotal: $524.97
This will save you 214 bucks VS the X58 build and it can be put elsewhere into the build ( like a new monitor or SSD ) you wont see much differences in games with the i5 750or the i7 920
The rest of saints build looks good ( really his whole build is good but for gaming IMO you don't need to spend the money for a X58 build else you want 3 way Xfire )