My First Core i5 Build - Any Help Please?

OK, To start off I really cant say one thing that this computer will be used for. Its going to be used for a number of task including gaming, so I want this machine to be able to play all the new games and also the usual like internet and office work. This is my first build ever so its probably guna need alot of improvements.

CPU - Intel Core i5 2500k (I will be overclocking)

http://www.scan.co.uk/products/int [...] he-95w-oem

MoBo - Asrock p67 PRO3 OR Asrock Z68 PRO3 (Cant really afford the ASUS P8P67 Pro and thought these are the second best option?)

http://www.ebuyer.com/product/261257
OR
http://www.ebuyer.com/product/267316


Memory - Corsair CMZ8GX3M2A1600C9 8GB 1600MHz CL9 DDR3 Vengeance Memory Two Module Kit (I dont know anything about memory, this was just a guess based on the cool looks of the heat spreaders )

http://www.amazon.co.uk/Corsair-CM [...] 792&sr=8-5

Case - Zalman Z9 Plus

http://www.scan.co.uk/products/zal [...] se-w-o-psu

HDD - Seagate ST31000524AS 1TB Hard Drive

http://www.scan.co.uk/products/1tb [...] e-85ms-ncq

PSU - Any Recommendations?

Graphics Card - Any Recommendations?

regarding memory:

http://www.tomshardware.com/review [...] 07-11.html

(the tall RAM heat spreaders will sometimes interfere with your desired CPU heat sink/fan....

Regarding GPU: depending on budget, I'd shoot for a 6950(2gb) or GTX560Ti; if too expensive, the 6850 is next; if too expensive, the GTX460(1gb)

Im very doubt full that I would need SLI or Crossfire, but if I did could you recommend a MoBo?

whats your budget for the gpu?