New gaming rig. . ..

What do you think of this build:

COOLER MASTER HAF X
GIGABYTE GA-P67A-UD4
INTEL i5-2500K
SEAGATE Barracuda ST31000528AS 1TB
KINGSTON 4GB 2333MHz DDR3
MSI GTX580 ( will SLI it somewhere later this year, will get an new PSU then )
SEASONIC SS-620GB 620W ( enough power for GTX580? I do plan to overclock it a little bit )
CORSAIR Air Series A70

And from the current rig i will keep MUSKHIN DELUXE 64GB SSD.

I would pick a bigger psu now so you wont have to pick one up later for sli. Also to save some cash you can just get 1600mhz DDR 3, you wont see any difference. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139022&cm_re=850w-_-17-139-022-_-ProductCorsair 850w

Like 04d said, the PSU is something you don't want to skimp on. I personally run a Corsair TX750 that works perfectly for my 4870. It should work fine for you, but be warned the cables are very hard to manage since it's not modular.

What about SEASONICSS-850EM 850W? Should it do fine?

Also, which RAM do you suggest from here : http://www.itsvet.com/kategorija/ram-memorije/comp_comp_ram

On the left side of the screen, it says PROIZVODJACI=BRANDS. Bellow are all brands which i can buy here. Could you help out :) ?

EXCELERAM 4GB (2x2GB) 1600MHz DDR3 Rippler ER3000A

This memory good? Will it work with UD4 motherboard?