Im building a new system and I am ready to order... but every eVGA or XFX 7900GT is out of stock... and I noticed that they have the highest clock and memory speeds. Now, the GIGABYTE version of the 7900GT is still there but I dont want to but it if theres going to be a difference between the cards... so is there going to be a good difference between these cards? I mean, I know that the 7900 of any manufactuer has to be better then any 7800GT out there... so is the eVGA version worth waiting for?