All macs meet the requirements to run PS but of course more is better. Just get one that has at least 4G of ram and you are good to go. I just upgraded to 12G (super easy and super cheap to do) but before I was at 4G. I would have chrome (with a ton of pinterest tabs open), PS, Bridge, Ai, Yahoo, Mail, iTunes, finder windows and a couple other apps open. The only time it would lag is when I would run actions that have many steps.
We have a 27in iMac and 13 in macbookpro. The laptop is my husband's and I find it very hard to use for scrapping or designing due to the small screen. I do use it for internet browsing. I love my iMac. It takes up no more room than a flatscreen tv the same size.
If you do get one, try talking to adobe. When I switched from pc they offered me a great upgrade price (PSCS4 had just come out) and sent me the mac version.
Oh- I don't think I would get a macbook air. They are more limited in storage and do not have a dvd drive.
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Amanda
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