PSU recommendation for new computer

Why i7? What will you be using the machine for?

A good 550W PSU would be sufficient. Seasonic and XFX have PSUs in that size that would be excellent choices.

I want a 750w since i want a steady one, for overclocking, and maybe sli in the future, and i need a specific recommendation from that specific store :-)
Tnx.

500W PSU will be sufficient for a single GPU build. As Onus recommended, Seasonic/XFX and Corsair are good brands. What is the PC going to be used for and what motherboard are you using? That would help in recommending RAM.

The 550W would account for overclocking. As for "steady," I don't believe Seasonic knows how to make one that isn't (they make the XFX by the way). If you want SLI though, then you would indeed want a bigger one. 750W would not be unreasonable for SLI of two powerful cards. The Corsair "AX" I believe is also built by Seasonic.

Seasonic all the way. I recommend the 620w modular psu as its a great value.

A Very Good PSU reasonable priced and gives you enough room for future upgrade http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And memory http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The Aurums are indeed also good, but he may need more than 600W for SLI. I wouldn't get any less than 650W, if only because around that size is where you begin to see the four PCIe power cables that are needed.
I frequently see good deals on the Seasonic X-650 and/or X-750; I'd snatch up one of them in a heartbeat.

First of all thanks for.all the replies.
This computer will run games and some video and picture editing.
I am going to use the asus p8z77-v pro mobo.
I want a good silent psu and i think i'd stick to the 750w to be prepared for anything as i don't live in the states but just visiting it won't be easy for me to upgrade at low prices as they have in microcenter.
I will be using the noctua nh-d14 which is really big so i need memory sticks that will fit with it. (Not high)
Please if you recommend me of something let it be from microcenter stock as i am going to buy everything there, in the California branch. All the other suggestions aren't helpfull as i won't be able to get it. As the seasonic ones (which i wanted), aren't sold by microcenter.

Thanks again.

Seasonic makes the Corsair AX series of PSUs.
As to the RAM, make sure it runs on no more than 1.5V.

I would go with a good 750 for future upgrades and add-ons...

Again, your answer, appreciated as it is, is of no help at all. I just wrote.that in microcenter - where I'm going to buy the parts, doesn't have the seasonic psu's.... And for the RAM - there are sticks that are two high to fit with the noctua nh-d14! So i can't buy those.
Pls don't waist your time in answering just to answer as it of no help for me.

The Corsair PSU you intend to buy was made by Seasonic! I am telling you that to confirm that it is an excellent quality unit. Some cheaper Corsair units (e.g. the "Builder" series) are made by CWT, and are not as good.
I do not know what Microcenter stocks, so I'm not providing RAM part numbers; what I am telling you about the RAM is to make sure that whatever you get does not require more than the standard 1.5V, to avoid putting stress on, and shortening the life of, the IMC in your Intel CPU.