Buying the parts tomorrow morning,any last thoughts?

Actually, there is only one part I would recommend changing: Unless you are doing very graphically intensive applications and/or gaming on multiple monitors, a GTX 770 is all that is needed. However, due to personal usage, I prefer Corsair Vengeance Pro RAM or G. Skill Sniper Series RAM instead of the Ripjaws.
 
I'd get a Corsair (get brand) 850watt supply, that way your ready for that second SLI'd GTX780 in the future.

I would stick with the GTX780 as you won't be able to Max out most modern games IF you dropped back to a GTX770 (I run a GTX690, which is basically an SLI 770/680 pair and there are games I can not max out @ 1920x1080...)
 


So,would you recommend that i get the 770 and later on add another 770 or just get the 780 now?
 


Got caught up with work and i haven't purchased the parts yet and i saw that the 400r is on sale(at the shop where i'm buying it from),would you recommend it instead of the 500r,are there any major differences between the 2?