Been awhile since I built a system, mainly play wow... advice welcomed

dual core and ddr3??only I7 procesors benefit from triple channel>>also,less money for the case and more for your main components, you have a good idea of what you want but there isnt any build that cant be improve, 775 socket is almost dead, and your upgrade path is going to be replaced by new 1366 socket, I think you better of with Phenom II, i have the 955 and its a beast, as good as the q9550, if not better. how about this:

http://www.newegg.com/Product/Comb [...] mbo.212581

http://www.newegg.com/Product/Prod [...] 6820227320

http://www.newegg.com/Product/Prod [...] 6814121311

overclocking and cheap dont mix, you need a better HSF than the artic 7

http://www.newegg.com/Product/Prod [...] 6835185093

you where spending way to much on a case, chances are you're gonna have less performance for better looks, dont think so, you can have both

http://www.newegg.com/Product/Prod [...] 6811119196

850 watt is an overkill for a single 4890 unless you planning a CF so how about
http://www.newegg.com/Product/Prod [...] 6817273008

unless you are going to use the pc as an storage build i dont think you need 1t
how about 640 caviar black ( http://www.newegg.com/Product/Prod [...] 6822136319 ) it has 2 320 plates which makes it quite fast

blue ray?? well its your go but a nice dvd burner will have been better if you ask me
http://www.newegg.com/Product/Prod [...] 6827129016

Subtotal: $1,086.92
Grand Total: $1,100.83

Since you're not building for a couple months, I'd put the paper build on hold and wait till i5 gets released. Prices will change a lot when it does come out, both on the AMD and intel side. With the budget you have, you are going to get WAY more computer than you need for WoW and HTPC apps. You should be getting at least a tri core if not a quad anyway if you are going to CF or SLI (which is an option if you get an i5 system.)

If you are going to move forward with this build though, 850w PSU is overkill. 4890 CF will do fine on a 600w corsair, so to be safe, the 750 would be a good match for you.

Before I picked up an E8500, I would take a good look at AMD Phenom IIs. Reason is the upgrade path is there in the future if you need it where, as mentioned, the Core 2 is end of life.

+1 to the Xigimech HSF

Mobo will follow the CPU choosen and I'd vote you pick a different platform.

There's cheaper 4gig dual channel DDR3 kits that are Cas 7 with 7-7-7-18 timings. GSkill or Curcial I think.

The 4890 is a great card. You'll have no prob destroying WoW for the next decade with that. So unless there are other FPS games you play, I wouldn't worry to much about CF. That being said, the GTX 275 is also a great card in that price range. If you i5, then you have the option to SLI.

And don't for get an OS.