These are all the reasons why I would go with the 13". I just assume that either one will have the 4GB.
I'm not sure I understand this. Why wouldn't you want it to be faster than a computer you plan on replacing.
So the second question: i have a macbook 2007 4GB 320GB 7200RPM computer. It stays on my desk at all times, hooked up to a 24 inch monitor. I hook that up to a 1TB drive. I have about 100 gigs left on my macbook.
During travel times, I leave my macbook at home. Constantly running. I use a combination of logmein and my ipad to access files from home and/or connect to change my torrenting files. (if i'm not home, why not just download tons of data while Im gone for 2 weeks).
The macbook is geekbench marked at 3000. Far exceeding the macbook 11inch. This is important because to stop from one computer collecting dust....i want set ideas. Macbook 2007 = my home desktop. Ipad = my couch potato and my work companion. Macbook air, my portable productivity machine / travel buddy.
If the get a 13inch macbook air with SSD. The speed improvement will make me NEVER use a my macbook 2007. More importantly, my macbook will be just collecting dust. Why would I want to use it? EVER. And here's the kicker, with only 128 gigs of SSD space, its wise to have another computer with tons of space to manage your data. My goal is the sell the macbook 2007 for a mac-mini.
Does that help? I'm trying to segregate ....not find that I have 2 computers that do the same task.
-------------------------------------------------------------------------------------------------------
My usage model:
I watch 1080p movies/720pMKV's
I browse the internet
I use Ichat
I use microsoft Office
I program or next perl code using unix terminal.
I use lightroom to edit some photos...
I use iphoto
I use itunes
I want to watch 1080p flash content
I use imovie like once a year
I blog
I don't use photoshop
I don't use aperture
I don't play games (although, i'm thinking of trying SC2)