I'm a longtime PC user thinking about making the switch... I have a 5 year old Dell laptop that's on its last legs, and ideally my next purchase will last me another 4 years. I was planning to get the i7 13" MBP with a SSD, but looking at some of the performance metrics made me reconsider. I'm not sure how much the SSD will improve it. I'm going to use it for music production and everyday use in general, and I do a lot of heavy multitasking. The screen resolution isn't important to me. Should the 13" with the SSD upgrade get me the speed and consistency I need, or am I missing something?