The Mac Pro is the only option for expansion but it is lacking in video cards. Drives and I/O are more plentiful but that only goes so far. Not to mention that a video card is a much more flexible expansion card with gaming and computation functions in one package.
$US 124.99 around here. I like Apple's notebooks but I do not believe Apple has been worthy of my money. Not to mention the entire reason is to run Windows on it.
My Macbook is really starting to show its age in terms of physical condition and performance.
I think we all forget though that 90% of people who buy are Average people who don't really "Game" per say. They use them and just do Work Schools stuff then turn it off. Most of us that are in mac forums I would like to think are much More tech Savy than the average person. The fact that we are in forums says some of that... Yes Gaming is not nearly on the forefront as P.C. Manufacturers... But most people Don't Care... So the Macbook Air sells pretty well. For me I think its A little Dainty. Call me quirky. But I like my electronics to have some heft and weight to them. Just feels like I am gonna break that stuff.