I want a new laptop, moving from my 2008 Unibody MacBook. It is the 2.4 with 4GB of RAM. It should be my secondary computer, but haven't really be using it as such. I have a somewhat neglected 20" 2.4 4GB 2008 iMac sitting here, and intend to use that more - well I have been using it more the last month or so. I also intend to upgrade the ram to 6GB. So I've been thinking of getting a new (2011) base MBA to replace my MacBook. I will be treating it as my secondary computer, and the lighter weight would be appreciated. Considering the SSD and newer processors, how would it compare in performance to the MacBook? For less money than the air I could get the base MBP, but I'm thinking it would be overkill and the weight of it would still be there. What would you do? Thanks!