Hey there, i was just deciding on a new video card that will hopefully last me over 3 years. I just received my new processor, an Intel i5 2500k, 8GB's of Kingston RAM and my new monitor, an Asus 24" and for my video card i was thinking of a an ATI 7870 but there's a cheap version, by Asus, and an expensive version by Sapphire. I know Asus is a well known brand so why is it cheaper? Also on ATI's website it's labeled as a 'GHz edition', is this for one specific brand or all?