Recommend me a nice PSU

Well for the current build a 600-650 watt psu would be enough, however for sli I would go for something between 750-850 watts.

You should take corsair ax series into consideration.
However there are plenty of other good power supplies out there.

Agreed. The ax 750 or ax850 would be the way to go if you have the money. If you want to save some money and still get a nice PSU, the HX series is semi modular and corsair also has a non modular series.

I recommend Corsair in general. It just depends on what you want to spend

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182133

It's a great price, modular and the Hive series get's awesome reviews from Hardware Secrets.

http://www.hardwaresecrets.com/article/Rosewill-HIVE-650-W-Power-Supply-Review/1460

This series also gets an excellent review

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139024
http://www.hardwaresecrets.com/article/Corsair-GS800-Power-Supply-Review/1103

Personally, I would go with the Hive. Better features & lower price.
Edited by Bubba Hotepp - 6/12/12 at 2:48pm

This would make an excellent choice, considerably more than you need for your single card setup and comfortably sufficient for you SLI option... excellent value too.

A 450w PSU would be enough for a build w/ a single GTX 680, 550w if you're worried about pumps etc. SLI, a quality 650w would be just fine.

Actually you can run SLI 680s on a 650. 750 if you want overkill and 850 if you feel like wasting money. Check out the OCN recommended power supply thread and you'll find a lot there. I would link but I'm on my phone. In regards to the corsair they are great units but typically overpriced. Aside from the AX1200 they have seasonic internals and are pretty much the same as the seasonic x series.


[Edit]
When I recommended the 650 watt that includes room for extras and plenty of overclocking. Fans barely pull any power unless you plan on getting some seriously high rpm fans.
Edited by VW_TDI_02 - 6/12/12 at 2:53pm

this, i love my AX850, was a breeze to install with great cable management and it allows me for my next lot of upgrading

but its bsically a seasonic unit and there are also some great seasonic units out there..
for example
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087

OCZ ZT 750W is a very nice choice for cheap

Fully modular, 80+ bronze and sli/cfx able