From what manufacturer should i get the R9 270X

I want to buy the R9 270X.I just dont know what manufacturer should i get it from?
ASUS or Sapphire?(I couldnt find the MSI in my country and Gigabyte wouldnt fit in my case)
Also,should i get the 2GB or 4GB version if I choose the ASUS one?
One more thing. Is my Phenom II X6 1055t gonna bottleneck it?
Thanks in advance :D:D
 
Solution
i believe, phenom II is still powerful enough for radeon 270X. but not Radeon 280 3GB
btw, do you now that 270X is just an OC version of 270? i would go for cheaper 270 and OC by myself


Yea,but i dont know how to overclock,or if my mobo can support overclocking
And also,i couldnt find a Sapphire 270 in my country,but i found the ASUS 270. It it a little bit more EXPENSIVE than the sapphire 270X