I know that the 5870 is supposedto be a really big card and the X2 is supposed to be even larger. I'm going to be building my own rig and I want to know how big of a case I need and what kind of motherboard is best. I don't want to spend a whole lot of money but if i need to I might spring for it. Keep in mind that I am a lowerclassmen in highschool so i dont't have a ton of money. Thanks in advance.