How big of a power supply should I get?

I was wondering if someone could help me figure out how big of a PSU i need for this set up.

 

EVGA P67 SLI 130-SB-E675-KR LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard


HD Radeon 6870


8 GB Ram


i5 2500K


This cpu is currently on sale and was wondering if it would work and reccomended?


http://www.newegg.com/Product/Product.aspx?Item=N82E16817371030&Tpk=17-371-030&nm_mc=EMC-GD111212&cm_mmc=EMC-GD111212-_-index-_-Item-_-17-371-030

You won't even need 500W honestly, but consider this, rock solid PSU, 80+ bronze, 5 year warrenty.

http://us.ncix.com/products/?sku=59615&vpn=P1550SXXB9&manufacture=XFX&promoid=1257

And thank you for using the enter key, few people seem to be doing that lately, the bold wasn't needed but all is well ;)

But the reason i posted that PSU is cuz it's on sale and it'll come to $25 in the end. Is it worth it?

Why would you think it would be $25 in the end? It will be $40 in the end, after the rebate.

You could go for it if you want, its a good PSU and will be $13 less than the one I recommended.