MacBook's are pretty expensive. I suggest iPad if you can't really afford MacBook. It's got GarageBand, iMovie and Photobooth and iOS 5. Wait a few months too, if you want the iPad 3.
HP ProBook w/ Hackintosh, because you can't afford a real MacBook (they're $1,200!) http://tonymacx86.blogspot.com/2011/12/hackintoshing-sandy-bridge-laptop-hp.html
You could probably find a used White MacBook from '07 or so for $400. Start with that, slowly upgrade it then sell for a profit. Take the profit and buy what you want at that time.