Well I come from a Windows background (way back to DOS 6.22 and Win3.1), and got an iBook 6 months ago. And I can honestly say that it's the best computer I've ever owned - I dumped my cheap plasticky Dell Inspiron 1100, and got a 12" 1GHz iBook. OS X is so well designed, it never (NEVER) crashes, and has simple little niceties like you can install applications by simply dragging them to your applications folder, and uninstall them by just deleting them - the entire app is contained in a single file. No stupid registry, no setup programs, no inane wizards. Not to mention it's so preettyyyy *eyes glaze over*.
Oh, and no spyware/etc. I think PCs are still cheaper, and will remain so, but price is not everything to all of us. I went the cheap PC notebook route, and was very unhappy. Lugging around a creaky Dell that didn't "fit" together properly that was SO HEAVY and got SO HOT is not fun, not even for R 7000.
And the iBook wasn't even that expensive - R 8999.
Don't get me wrong. I like Windows, it's got all the games of course (well, almost), and Macs get games much later than PCs, but for people that don't play games that much (like me), they're perfect.
Having said that, R 4600 is too much. They can shove it at that price.