Within the next week I think I'll be buying a MacBook, but can't decide which. I've narrowed it down to 2 choices (I think) 1) Refurbished MacBook Pro 2.66GHz Intel Core i7, Originally released April 2010, 15.4-inch LED-backlit antiglare Hi-Res widescreen display (1680 x 1050 pixel). I like this because of the i7, and screen resolution... I think... But it's last years, and I thought I read that the new Airs were arguably as fast as the older Pros? 2) New MacBook Air 13-inch, 128GB, 1.7GHz dual-core Intel Core i5 processor. On the surface, I would think that a 2.66 i7 in the pro is going to be much faster than the 1.7GHz i5. It sounds sort of obvious to me, but... Rather than just assume that bigger numbers translate into higher performance, I thought I'd ask. The i5 in the Air is SandyBridge, right? What's the older i7? Is it really going to be a big speed difference?