Hey - I've decided to buy my first Mac ever, and I'm stuck between two options Option 1) 13" MBA 2012 Option 2) 13" MBP 2012 My main attraction with the Air is the portability - that thing is super light. Yet I'm worried about being unable to upgrade, which is one of my main + points with Windows PCs. In the MBP, I would be able to add my own SSD and aftermarket RAM, giving it the disk speed of the Air, with the CPU of the Pro. Bottom line: Is the MBA fast enough to work for 4 years? I'm concerned that a Dual Core ULV won't keep up that long... Also - how much would either machine be better than my current machine. Specs: Dell Studio 1555, 2.4 GHz Core 2 Duo, 4 GB DDR2 RAM, ATI Radeon 4500, 7200 RPM HDD. Thanks in advance!