Go with this and save yourself 50 dollars. 955 to 965 is not worth 50 dollars. 965 is basically a higher clocked 955.
http://www.mwave.com/mwave/skusearch_v3.asp?scriteria=BD11182&parent=2
I think a 4770 will do WoW just fine at highest settings and at that monitors highest resolutions. Another 50 dollars or so depending on the 4870 you wanted to get.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150369&cm_re=hd_4770-_-14-150-369-_-Product
And that PSU is overkill as well. the gpu i picked out only requires a 450w and unless you're doing heavy overclocking 500w is all you'll ever need.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016
EDIT DVD drive is probably the easiest part of building it. Take a watch at this build guide. The worst part of building it is taking time out to update all the drivers.
http://www.youtube.com/watch?v=TVion6qcocs
EDIT 2 Save another 40 bucks by switching to this mobo http://www.newegg.com/Product/Product.aspx?Item=N82E16813130265
You'll also have to go with DDR2, which isn't bad, WoW isn't that intensive. I'd suggest this, great timings. http://www.newegg.com/Product/Product.aspx?Item=N82E16820231098
I agree with most of this post except I'd go ahead and go with the cheaper motherboard but stick with am3 + ddr3.