750-800w

can anyone recommend a good quality and fairly quiet power supply?

Depends on your budget, really. I don't want to look like a fanboy and recommend a brand instead of a specific model, but the truth is Seasonic makes awesome PSUs in all budget ranges. I'm going to direct you to their site. General rule of thumb: the higher the efficiency, the better the PSU. http://seasonic.com/product/pc_retail.jsp

If you don't live in the US, then you are in luck, because you can probably get your hands on Super Flower PSUs, which, again, are almost as good as Seasonic, and cheap(er) too.

A good site for PSU reviews is this one: http://www.jonnyguru.com/index.php. If a PSU has above 8, it's a good, solid PSU. If it has above 9, it's an excellent unit.

I second that. I was rather hesitant with the SuperFlower PSUs but they are good. A friend of mine has it in his system.Not bad for what he paid.

i don't have much of a budget on the psu just not ridiculous. i was thinking around $150. I live in Australia and i have never heard of superflower psu's. do you know any reliable websites where i might be able to look for and order one?

http://au.pcpartpicker.com/p/eLZ 

Power Supply: Silverstone Strider Plus 750W 80+ Silver Certified Fully-Modular ATX Power Supply  ($149.00 @ PCCaseGear) 

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=183

You realy dont have a lot of gear to pick from in Australia this one is a solid psu just on your budget of $150 AUD

 

Taxes might offset any price differences. Sorry,i'm not too sure on Australian websites. Is there a Aussie version of PCPartPicker? Perhaps that could help.

Yes there is an Australian pc part picker, the $150 was only a guideline and i was most likely going to buy it from amazon and get is shipped.

I am sorry, but I don't know of any Australian Super flower retailers. You could try searching for Super Flower Golden Green Pro (80+ Gold certified) or Super Flower Golden King Pro (80+ Platinum).

EDIT: Here's a review of the Golden King from Jonnyguru, to spark your interest in the line: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=286

is there a reason you need 750/850W?

i dont need one at the moment at the moment i only need around a 500 w psu but i am planing on adding a second graphics card later on (once i get more money). i am thinking about either a 770 or 780 so ill need the extra power.