New Gaming Pc Buiding

Hello everyone,
I'm newbie and planning to build a gaming PC for the up coming games, such as Battlefield 3.
I have in my mind every parts that needed, so here is the list :

1. Motherboard: GIGABYTE GA-Z68A-D3H-B3 - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16813128502
2. CPU: Intel Core i5-2500K Sandy Bridge 3.3GHz - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16819115072
3. Ram: Crucial Ballistix sport 4GB (2 x 2GB) 240-Pin DDR3 - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16820148418
4. Hard Drive: Seagate Barracuda ST500DM002 500GB 7200 RPM - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16822148767

5. CD/DVD Burner: ASUS 24X DVD Burner - link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16827135204
6. Wireless Adapter: TP-LINK TL-WN722N Wireless Adapter - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16833704045
7. CPU Cooler: COOLER MASTER - Link: http://www.newegg.ca/Product/Product.aspx?Item=N82E16835103086

Missing Parts:
1. PSU - still can not decide which to buy, how much watts do I need to get my PC run perfectly ?
2. GPU - planning to get GTX 550 Ti for running SLi OR GTX 560, 570 or 580 for SINGLE if my budget is capable. Therefore I don't know which one to get, I plan to wait till the Battlefield 3 officially released then will decide, but Does anyone know which one should I get ? I think the BF3 requirement is : 4GB of Ram, GTX 460 or Radeon 6850.

Please help me to choose two of the missing items. My budget is really tight, can afford below $1000 only. Also, What do you think about this PC ? Is it good enough to run BF3 ? If there's any parts that you think might be not good, please advise me. :ange:

Thank You. Have a good weekend. ;)
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