Hi, I just (5 minutes ago) ordered the new 13" MBA. I got the 256 GB hard drive and upgraded the ram but didn't upgrade the processor. Is there any disadvantage to do this. I.E is it possible that the processor will bottleneck and not allow me to make full use of the 4gigs of ram. I'll be using this for college and don't do anything that will strain the computer in terms of performance. I was just thinking, if I spent over 1200 pounds on the computer, what's 70 more on the processor. Should I and can I change it?