Customer support isn't really much of a big deal where I live. The store that I'll buy one of the products from are very kind and give good warranty.
I'll cross out PowerColor, bad quality from my old HD4650.
So HIS IceQ X has these as an advantage:http://i.imgur.com/61FiP.png
while Sapphire's offer seems to be nothing more special than the reference 6870.