Currently, I have the Macbook pro 13 mid 2009. Needless to say the device is getting slow and laggy to the point where its difficult to use. I tried ssd upgrading twice but sata 2 and 3 ssds don't work properly with this device. There are constant freezes and beachballs every now and then and I have to force restart the mac every time that happens. The problems disappear when I put in the original hard drive but the 5400rpm is just too slow especially when coupled with an old core 2 duo cpu. Apps take forever to load. So its time for an upgrade, I can upgrade in one of the 2 ways- 1. Get a macbook pro 15 retina display. ($2280 - $400-500 after selling my old mac) 2. Get a 13 macbook air ($1299) and keep my old macbook pro for itunes library. As the 128gb on the mba isn't enough for it. I only need this macbook for university works, web browsing and itunes. I do not need discreet graphics for gaming as I already have a dual gtx670 desktop. So should I spend $1000 more for the retina display? or take the mba and save $1000?