Budget build, need some advice.

I decided it's time to upgrade my computer. I am running a pretty old computer that includes a X2 4200, pc3200 ram and a 7900GS. It plays the games I want, but not on the settings they should be, so I decided to upgrade. Here is what I am thinking.

-Crucial Ballistix PC2-6400 4GB 2X2GB DDR2-800 CL4-4-4-12 240PIN Dual Channel Memory Kit

-Seagate Barracuda 7200.11 3.5IN 500GB SATA2 8.5MS 7200RPM 32MB Cache NCQ Hard Drive

-Coolermaster CM 690 Mid Tower Black ATX Case 5X5.25 5X3.5INT No PS Front USB Sound Firewire & eSATA

-PC Power & Cooling Silencer 750 Quad 750W ATX V2.2 EPS12V 24PIN SLI Active PFC Power Supply Black

-Samsung SH-S203B Black SATA DVD+RW 20X8X16 DVD-RW 20X6X16 DL 18X/12X INT DVD Writer OEM W/ Vista SW

-ASUS P5K-E/WIFI-AP ATX LGA775 P35 DDR2 1333FSB 2PCI-E16 3PCI 2PCI-E1 SATA2 Sound WLAN Motherboard

-Arctic Cooling Freezer 7 Pro LGA775 2500RPM 45CFM

-Intel Core 2 Quad Q9450 Quad Core Processor LGA775 2.66GHZ Yorkfield 1333FSB 12MB OEM No HSF

I have store credit so the Case (which I have worked with before, great case) and Powersupply are going to be "free". The rest I can do for about $800. I have a budget and really don't want to go up to $900 before tax. The main thing I was wondering was should I go with this motherboard or do you suggest something else? I don't plan on going with SLI any time soon I also don't really need Wifi. So any suggestion on a different motherboard would be great. I am going to use my 7900GS and grab a 8800GT when they go on sale later this month.

Any other tips, suggestion or advice are welcome.

Looks good, but if you can get your hands on this CPU HSF (assuming your going to OC some):
XIGMATEK HDT-S1283 120mm Rifle CPU Cooler - Retail
http://www.newegg.com/Product/Prod [...] 6835233003

It's better than the ACF7Pro. Review here:
http://www.frostytech.com/articlev [...] cleID=2233

I'd also save some $ on the q9450 and just get the q9300 and use that extra $ on a better GPU (i.e. 8800gts/9800gtx/3870x2)

He's gettin' the case/psu for free!

What do you mean when you say "free". Is that different from free, any catches there? If you can get a bit more credit/save some money, go for the Corsair 550VX.

When I said "free" i meant with store credit I got from buying other things. However I will look into a less powerful PSU. Was looking to future proof a bit with it. I also don't think I will be Overclocking so I went with the Arctic.