Ah, the eternal question. A refresh for the Mac line is coming sometime soon, and I'm toying with upgrading my 2010 15" i5 MacBook Pro. It's a good machine, but heavy for a laptop. Every time I lift it with one hand, I worry that I'm gonna break my wrist. I've got the money, I'm just indecisive on what to buy. A low end iMac or a 13" MacBook Air. Both will have 4GB RAM, and hopefully the MBA will have more than 128 GB of SSD space. The only gaming I do is WoW, so a graphics card isn't an issue. The only thing that concerns me is the difference in overall processor speed, currently 2.5Ghz for the iMac and 1.7Ghz for the MBA. I also have an iPad for surfing the web away from my desk, but it can't do everything that a proper computer can do. (I would kill for a decent MUCK client for the iPad.) What it comes down to is the portability versus the fairly significant processor speed difference. Is the processor speed that big of a deal?