From all that I read when I googled Kentek Power Supplies was; run away from it as fast as possible. The rest of your system looks good, but a cheap power supply is cheap for a reason. You should not use that PSU until you get a new one because it could fry your whole system if it goes bad while you're using it. I found this story on a different forum when I googled Kentek:
" I had a neighbor that bought a 1050watts Kentek and he was telling me it was such a great deal ,he got it for $49 and he said it says it will run a quad SLI system.I told hime to be careful because if it could run a quad system why does it just have one PCI-e 6 pin plug and 2 - PCI-e 8 pin plug.He told me he had adapters .He has three GTX-480's that he bought at a flee market for $325,He has a old X58 motherboard but he did'nt know the brand.I offered to help him,but he was one of those persons that knew it all.A long story shorten the power supply started clicking and poping and then smoke started comeing from the power supply.I tried to tell him that the power supply might run one of them ,he just had two in it when all this happen.I have tried to look up the Kentek power supply but I can't find who makes it.But I did'nt think a 1050watts power supply for $49 would be any count.As it has been said to me you get what you pay for."
You also do not need a 650W PSU unless you want to run multiple GPU's down the road. You could get away with a 450W PSU no problems.
I would recommend one of these:
(If you live in the States the Rosewill Capstone is one of the best bang for your buck PSU's)Rosewill Capstone 450-M
If you are not in the states, one of these:XFX 550WSeaSonic 520W M12IIAntec HCG-M 520W
Modular is always really nice for cable management, so if you can get one of the modular ones. The XFX one is the only non-modular ones on the list, but it is also the least expensive.
On most of these PSU's the difference between 450W and 550W is nil or $5, any would be great for your system. If you decide that you want a 650W PSU, then check out this list for what OCN recommends: OCN Recommended PSU's