Should run WoW just fine. My system is quite a bit less powerful than yours, and when I used to play, I played at 1440x900 (in windows mode), along with MSN, WMP, Firefox, etc. open, and almost always had 60fps (the frame rate cap).
Speaking as someone who is running WoW on a 5 year old computer, this is almost definitely overkill. To answer your question though: yes it is all compatible and yes it will run WoW on max settings/high res with no noticeable lag with the possible exception of the major cities.
Says it is Intel i5, i7 compatible. Does this work with the amd cpu I chose?
err.. your link isn't working for me.
ed: managed to get it to work by looking at your BBcode.
That part is a massive ripoff on Newegg (both .com and .ca)It should be priced at around $30 or less. (I live in Australia and I can get it for $36AU) There are some other good coolers that aren't big ripoffs, but I don't actually know much in the way of good cpu coolers so somebody else'll have to help you with that.
ed 2: looks like b2 got you a good link/price on the Hyper 212+. Nevermind then.