Ive tried my fair share of Operating Systems, From Linux Mandrake to OS

10.4.8), XP, 2000, 98... and Vista.
If your looking for overall usability and getting the most out of your hard earned $$$ I would recommend Vista in a heart beat.
For the amount of money you dish out to get a mid level Mac computer you could easily get a top of the line PC that will handle anything you throw at it. I mean lets face it, 4 years ago OS X was good for graphic editing (it still is), but with programs like Photoshop... etc there isnt anything graphically that a PC can't do that a Mac can.
There is an arguement to be made about the cost of Vista (400$ USD for Ultimate). Well here is my arguement to the OS X owners on that; Wile we pay 400$ USD for the OS we also get free updates & Service Packs. For example it was what 5 years till Microsoft released Vista, ok then now lets say Apple releases 1 update a year, and its 120$ to buy OS X if im not mistaken? That adds up to 600$. So theoretically people who are hardcore OS X fans pay 200$ more in the long run than people like me who bought Ultimate. Pwnt?
How can you even call Apple a competition? 10% of the market is like a fly on the back of an elephant.
And I won't even get into the whole gaming scene. Kind of funny really, I've been in arguements before with Mac owners where they claimed they can game on OS X!!! When questioned they tell me they run bootcamp (basicly an emulator of XP, I dont care what people say, IT IS A FORM OF EMULATION!) and run XP inside their Mac, let me get this straight, they hate Windows so badly that they switch then fire up bootcamp and run XP? Wow, I don't mean to insult anyone but way to be a big **cking hypocrite.
In the end it comes down to your personal choice, not everyone enjoys Windows, and certainly not OS X.