Homebuilt system in a month, any suggestions?

I wont be using it for hardcore gaming but my slogan is "what today's games require tomorrow's office suites will require" so I'm going with some good parts. A few explanations as to the parts I'm getting:
- I have failed to fill up a 150 GB HDD in the past six years so I really don't need a 1 TB HDD.
- Since CPUs are not upgradeable 3 years down the line (mostly because u can't find a retailer for your CPU at that point) I'm getting the best i can afford which is the Intel Core i7 2700K which will be even cheaper once Ivy Bridge comes out.
- I usually just run MS Office, Virus Scans, Firefox, and Adobe CS4, though I do like to watch videos I don't really care for Blu-Ray. - I have no intentions of overclocking as I plan on keeping this computer for the next 6 to 8 years and need it to be able to run MS office.
- Since I hardly care for games I'm only getting a mid range GPU.
- Silence is extremely important in a computer case to me and the best silent case, as far as my research shows, is the Corsair Obsidian 550D.
- I'm getting tons of RAM because I never want to see memory usage go over 20% again.

So heres the parts (prices are after tax/shipping)

1. CASE: Corsair Obsidian 550D http://www.newegg.com/Product/Product.aspx?Item=N82E168... $130
2. MOBO: ASRock Extreme 4 G3 http://www.amazon.com/ASRock-MB-P67E4G3-Intel-P67-Mothe... $150
3. CPU: Intel Core i7 2700K http://www.microcenter.com/single_product_results.phtml... $320
4. CPU Cooler: Cooler Master Geminii S524 http://www.newegg.com/Product/Product.aspx?Item=35-103-... $37.50
5. RAM: 16GB Kingston HyperX DDR3 1600: http://www.amazon.com/Kingston-Technology-Modules-KHX16... $80
6. GPU: HIS IceQ Radeon HD 6790 http://www.amazon.com/HIS-Radeon-Eyefinity-Mini-Display... $130
7. PSU: OCZ Modular 600W PSU http://www.amazon.com/OCZ-ModXStream-Modular-Performanc... $75
8. HDD: Western Digital 500GB 7200 RPM http://www.amazon.com/Western-Digital-Caviar-Cache-Desk... $85
9. Optical Drive: Asus DVD burner http://www.amazon.com/Asus-24xDVD%C2%B1RW-Serial-Intern... $21
10. Card Reader: Sony 17 in 1 http://www.amazon.com/Sony-MRW620-U1-181-Internal/dp/B0... $15
11. Case Fan(s): Silverstone FM 121 http://www.amazon.com/SilverStone-FM121-Control-Designs... $17
12. OS: Windows 7 Professional 64 Bit Free got it as a present

Total is: $1060.5

Also, what I'm currently running is a Pentium 4 640 (3.2GHz)/3GB DDR2 RAM/Radeon 4650 system that can't handle a virus scan running simultaneously with photoshop CS4 and Mozilla Firefox, I was also wondering will this system handle virus scans well or will they slow it down too?

EDIT 1: I just noticed the 2700K isn't on the ASRock CPU support list but clearly 1 person on newegg says they got it to work and I see no reason if it supports the 2600K that it wouldn't support the 2700K but could that be the case? http://www.asrock.com/mb/cpu.asp?Model=P67%20Extreme4%2...