Best 700-800w for my pc?

[xaku]

http://pcpartpicker.com/part/corsair-power-supply-ax760 $119.99 after rebate
http://pcpartpicker.com/part/corsair-power-supply-hx850 $109.99 after rebate
http://pcpartpicker.com/part/corsair-power-supply-rm750 $99.99 after rebate

Will o/c 4770k and have a single 280x. I will probably purchase another 280x in the future, not anytime soon though. The HX850 is going for cheap but should i just go with the ax760? I heard great reviews and many negative reviews on the ax760. Should i be worried? I want a quiet and efficient psu to last.

 

[aevm]

Look for 900W or more if you want 280x Crossfire.
http://www.realhardtechx.com/index_archivos/Page362.htm

Some ideas:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139057
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139034

 

[xaku]

Well a very good 700-800w would be perfect for crossfire. But currently I am using one 280x and i won't be upgrading for awhile. A 1000w would be overkill for a single card right now.