I'm a potential switcher and went to my closest Apple Store over the weekend to check out the products. I loved the 12" design, screen, portablility, etc. However, it felt slow to me. Rather, it felt the same speed as the Pentium III desktop I use at work. And if I'm dropping $2k on a computer, I want it to feel snappy and fast. So here's my question, I was looking at a base model with only 256mb RAM. I understand that OS/X is pretty RAM intensive...if I boosted the RAM to the full 640mb possible, would I notice a signigificant speed boost? Would programs loud quicker, with fewer "bounces"? My hope would be to have the most common apps I use load (almost)instantenously...ie, Safari, iPhoto, iTunes, and Word and Excel.... Thanks.... PS: What would be the usuable life of the 12" based on previous Mac update cycles? At what point would it become completely obsolete?