So I'm building into the Lian Li TU100 (http://www.newegg.com/Product/Product.aspx?Item=N82E16811112408) and wasn't sure where to go with the PSU.
Power: First off its going to be built with an I5 4670k and GTX 670. I'd like to leave a little overhead for overclocking if I can, and I was thinking in the range of 350-400W. Do you think I can get away with less or do I need more?
I don't think it matters too much for power, but there will be no optical drive, a 2.5" HDD and SSD, and a closed loop cooler.
Size: Second, I can't quite figure out what form factor I need to go with for the PSU for it to fit in the case. From what I have managed to find it seems to take "SFX power supplies up to 170 mm" (acording to http://www.techpowerup.com/184616/lian-li-announces-the-pc-tu100-mini-itx-chassis.html), but I honestly have no idea what that means.
Any help would be much appreciated and thanks in advance.