Hi all, I had thought that when the time comes to replace my macbook I would go with a MBP, but now i feel liek I shoudl get the MBA because of SSD. I don not need a laptop so that I can carry it around, becuase it will be used at home most of the time on my lap. Now the only thing with MBA is space and cost. I want to get the 128gb ssd with 8gb ram. I want to know what external HDD shoudl I get as I want the itunes and iphoto library to be in the external drive. Shoudl I get a usb 3.0, thunderbolt or SDD external drive. SOrry for the noob questions, but which of these is teh most cost effectiev solution.