I agree with the general consensus here that you should be fine as long as you do not have any memory intensive apps or programs. My first mac was a 2011 mini with similar specs to yours. I then got a MBA (i still own and use) and honestly could not tell much difference in performance between the two. I now have a 27 in imac with 12 gb of ram and rarely think about what is running because it can handle it all, but when i go to my MBA i try to be much more careful. I only have one program that lags somewhat but it is a very large program and often needs to preform library indexes which sends the air into turboboost mode and takes up most of my ram (not something that any other program does). Still, the MBA runs this program fine as well as everything else. Unless you have something large (doesn't sound like it), i would recommend the MBA as a great (and faster) option especially with an external display.