Some friends convinced me to have a go on windows 7 saying it wont crash more than OSX and its easier to use... really? It crashed within the first 10 mins of use. It wouldnt even open a large maya file. I even tried importing it as an object but it crashed after 20-30 seconds of it opening. This was in a brand new bay of PC's. It may be down to me being too optimistic about a new so called perfect version of windows, but it was terrible.
I don't think your experience was at all typical. In my experience Win7 is very stable, at least as much as an OS with a system registry can be.
I've always built my own boxes, and for a long time used a hackintosh system. Over time I incorporated more and more OSX software into my workflow, and I eventually bought a Mac Pro. I know folks get militant, but I won't ever go the hackintosh route again. It's too much of a pain to setup, and something as simple as a CPU upgrade can break it anyways. Bottom line, if I am using the machine for work.. I need to be able to recover it ASAP after any type of potential disaster. I couldn't be certain I could do that with the hack route. It was fine when it was working though.
It's hard to describe to somebody who doesn't work like me or who has only used Windows, but it's worth way more than $1-2000 to me. And it isn't just OS X - take a look at the design of all of Apple's products, especially the inside of the Mac Pro. Everything Apple makes screams quality and screams flow, at least to me.