I am going to buy an MBA and have been reading widely about the speed differences between the 1.86 and 2.1 SSD machines. Here are my options: 1. Buy the rev C 2.1 with 128 ssd at an educational price of $1699.00 and also get a free Touch, a $99.00 credit towards a printer and the ethernet dongle included. 2. Buy the rev B refurb 1.86 with 128 ssd for $1449 and not get the Touch or the dongle. 3. Some other option I have not considered... Thanks for your help.