I have a couple questions. First, what's the major difference of USB 2.0 vs 3.0 and is it worth paying the extra. Second, if a motherboard has built in wi-fi do I need to buy the wireless card with the antennas? Bare in mind I'm a travel nurse so I won't be able to hardwire everywhere I go and will need a good connection. And third, I was pricing a build against an ibuypower machine and the pre-built came out cheaper for the same components plus some. Which would you do and why? This PC will be primarily for gaming. Thanks in advance.