New Budget Build Review Please (trying for under 800)

Approximate Purchase Date: Within a Month or 2

Budget Range: 600-800 after rebates

System Usage from Most to Least Important: Gaming (World of Warcraft and if MoP flops, be able to handle a first person shooter)

Parts Not Required: keyboard, mouse, monitor, speakers, case with 650w power supply.

Preferred Website(s) for Parts: newegg.com

Country: US

Parts Preferences: by brand or type: No pref

Overclocking: Never done it, so I'll throw a maybe

SLI or Crossfire: No

Monitor Resolution: 1600x1200, 1680x1050, 1920x1080, 1920x1200

Additional Comments: Just trying to get a PC that will last another 5 years (been playing wow for 5 on my current)
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Here is what I have so far. Wish list # is 19529052


MOBO:
ASRock Z77 Extreme6 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

My last case (which I'm reusing) had a ATX mobo in it as well if a question would arise about the case model (which I don't know as I didn't buy it from newegg and can't find a trace of a model (just know it's an ANTEC).


VID CARD:
SAPPHIRE Radeon HD 7850 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card (11200-00-20G
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


CPU:
Intel Core i5-2400 Sandy Bridge 3.1GHz (3.4GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


RAM:
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


HD:
Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


DVD:
ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


OS:
Microsoft Windows 7 Home Premium SP1 64-bit - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


This all totals to 840, but since I don't HAVE to have it right now, I would figure maybe some of these prices would come down within that time frame. (Also another reason I'm posting here, as you guys might would know a better price on something equivalent)

I know WoW isn't the most graphic intensive, but then again, I and my friends are not all that enthused about Panda's either. I'm not going to judge to hard yet, but the trailer right now is focused on Kung-Fu panda, and not anything epic like trailers of the past. (BC, Wrath, Cata) If it flops, we'll most likely go to a first person shooter, which I can only assume will need a nice system.

To put it into perspective, I have been playing WoW on all lowest graphics settings, and I completely lag up if in a 25 man raid or a 40 man AV and the fighting is intense. My Nvidia 9600GT doesn't perform well anymore (never really did, but acceptable when I put it on all low graphics) I was happy for 5 years of gaming off of it though for sure, even if it wasn't stellar.