My First Custom Gaming Computer!?

My computer just gave out (the motherboard, processor, and graphics card) so I thought I might as well build a new one. I have done tons of research and I'm trying to keep the build under $300. I play World of Warcraft and would like to play it on high or ultimate settings with above 40 fps as well as maybe... show more My computer just gave out (the motherboard, processor, and graphics card) so I thought I might as well build a new one. I have done tons of research and I'm trying to keep the build under $300. I play World of Warcraft and would like to play it on high or ultimate settings with above 40 fps as well as maybe some upcoming MMORPGs coming out soon.

Here's the build I have so far:
500w Antec PSU (recycled from another computer I have)
500 gig SATA II Hard drive (the one from her old computer)
The old Lenovo case about 14 inches tall and 16 inches long

Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813138283

Processor: http://www.newegg.com/Product/Product.aspx?Item=N82E16819103920

Ram: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277

Graphics Card ($44!): http://www.newegg.com/Product/Product.aspx?Item=N82E16814150482

RW DVD-Drive: http://www.newegg.com/Product/Product.aspx?Item=N82E16827106289&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=3463938&SID=

It all totals out to around $277 with 3 day guaranteed shipping for all of it.
Let me know what you think about the build as well as any suggestions you may have.

Thanks!
Jake
Update: Thanks for the answers so far. It comes out to $247 after rebates, which leaves a little wiggle room for upgrading the parts I mentioned. As for the OS, it's vista and it did come preloaded onto the computer, but I have already switched motherboards (plugged the hard drive into another computer with completely... show more Thanks for the answers so far. It comes out to $247 after rebates, which leaves a little wiggle room for upgrading the parts I mentioned. As for the OS, it's vista and it did come preloaded onto the computer, but I have already switched motherboards (plugged the hard drive into another computer with completely different motherboard) and it works just fine.

That motherboard looks great, but I have no idea how to unlock the extra cores or anything like that. My computer knowledge is pretty shallow atm. I would like to do that though, so it will be something I will definitely consider. I think it may be too big for my case though, that's why I went with the Micro ATX mb.
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