You don't need SLI/CF for those games. CoDBO is not as power-hungry as Crysis. Even a gtx 460 will play smoothly at your resolution with image quality maxed out. I suggest you wait for Tue for gtx 560 to be released for about $270 US. WoW is a very dated game which can be played on even modern onboard video. It is, however, very network latency-dependent. So I'd focus on getting fiber or the fastest DSL if I'm serious about WoW grinding.http://www.legitreviews.com/article/1465/3/
Not sure why you're limiting your hardware selection to one store. Probably has to do with your payment. I get whatever I can fastest & at a reasonable price.
No to i7 950. Why get last gen when you can get current gen like LGA1155? There's one socket coming out to replace LGA1136. At least i5 2500 + a P67 ATX mobo. Throw in a 500-600W quality psu like Seasonic. Any mid or full tower case. RAM will be DDR3 2x2GB. Any speed. Remember to focus on gpu if given the choice since you're building a GAMING rig. i.e. a more expensive gpu & a cheaper cpu. If you plan on keeping the gpu for a long while, get a slightly overkill one like GTX 570. But I'd still wait for the 25th.