Power supply for my new Rig

[Bruno Zurich]

Greetings,

I have a newly setup rig with the specs
Mobo: Asrock z77 Extreme 4
HDD: 1TB Hitachi Deskstart
GPU: Sapphire Radeon HD 6570 2GB
RAM: F3-12800CL9D-8GBXL
PSU: Corsair TX650 v2

Now I'm setting up a new rig for my cousin, the only difference is the RAM, he's getting F3-12800CL9Q-16GBXL. The problem is the PSU, they don't have the Corsair TX650 v2 anymore. It would take 3 months before they would restock. They have the TX650, the v1.

Comparing the 2 versions v1 (http://www.corsair.com/tx650w.html/) and v2 (Enthusiast Series) in the tech specs, I don't see any difference except the Dimension?

Is it ok if I buy the v1? Other shops in area has the ff:
Corsair GS700W 80+ 800W Tri-Color
NZXT Hale82 650 & 750w
Silverstone Strider Essential 500 & 600w
Thermaltake toughpower XT 575w
Silverstone Strider 80+ ST50F & ST60F
Silverstone Strider Plus 600W 80+ Modular
COOLERMASTER GAMER EXTREME 80+ GX550W & GX650W & GX750W




I don't want to buy online so I'm stuck with these options. Really need your feedback.

Thanks