The PSU is not Seagate, it is a SeaSonic and they are one of the best and most reliable PSU manufacturers. If you can not get SeaSonic-- go with Corsair here. You do not want to skimp on PSU, and XFX is not a brand I know well and not one many people know at all (as far as I know). I have had good personal expereinces with both SeaSonic and Corsair's PSU's.
I never got specifcic models for the RAM so I was assuming they had the same specifications and price and Corsair RAM is better and more reliable in my opinion so I would go with it. :)
Oh! XFX is very popular and is one of Motherboardsorg's fav brands ;)
And I've heard Kingston should be more reliable than Corsair but maybe Corsair is faster I dont know about that. But it's just... The Kingston HyperX Beast looks,,, well BEAST! and it's pretty new. But ALOT of people has vengeance so im just kinda confused what to choose. And the HyperX Beast is only few days old, so not that many reviews.
But well thank you anyways :)
Ps. I knew it was called Seasonic and Logan loves 'em But I just watched a movie that was made by Seagate so by accident I wrote Seagate :P
+1 on the advice with the PSU. I would take a look at some of AMD's offerings, for the same price as that i5, you can get the AMD FX-8350. You might be able to find an AMD cpu which performs very similarly in the benchmarks and save a few bucks to invest in more ram, or the higher-quality power supply.
If you really cannot afford the real high quality power supplies I personally would not worry too much, usually if you get at least an 80+ bronze power supply it will have decent quality parts.