I Need Help With My Rig

Hey guys i am planning on buying my rig in the next week or two and i need some help. i have a motherboard ma790xt-ud4p and a thermaltake v9 black edition on me and i am planning to buy

Antec TruePower TP-750Watt. PSU

G.Skill Ripjaws 4GB Kit(2x2GB) DDR3 1600 RAM (Intel 1156pin, AM3)

AMD AM3 x6 1055T 2.8Ghz Phenom II

These are all being bought from msy and with the graphics card i dunno what to get. i am looking at the 5850 but theres 4 brands to choose from witch are.
Gigabyte| His| PowerColor| Asus.

No Model Numbers Either >< Dam MSY!

Some Pics tho

http://www.msy.com.au/images4/VGA/Asus/5850.jpg

http://www.msy.com.au/images4/VGA/Gigabyte/5850.jpg

http://www.msy.com.au/images4/VGA/HIS/5850.jpg

http://www.msy.com.au/images4/VGA/Powercolor/5850.jpg

I Need Your Opinon on what one to get and will all those parts go together? soz for being so noob i just dont want to spend 1k and needing to buy another mobo or something ><.

It really doesn't matter about which manufacture you go with. Asus and HIS are both great choices IMO.

orkslayer,
personally from experience I wouldnt buy from MSY ,Also have heard to many other people complain about getting DOA and open box stuff from them, and if you want to return them they charge for that and dont do refunds just give you a credit note if your lucky

You would be better going to either of these
http://www.pccasegear.com.au/
http://www.scorptec.com.au/