I haven't read all the way through everything posted, but here's my two cents, anyway:
It really doesn't matter what type of computer you have, you can generally do all the same work on a PC as you can on a Mac, and generally the same work on a Mac as you can on a PC.
This is the issue - when your PC breaks, you can fix it. When your Mac breaks the world ends. If I have something go wrong on my computer, I just research the issue and it's taken care of, generally without leaving the comfort of my home. My best friend only uses Mac and half of the time she could be working, she's at the Apple store in tears. And it seems to be like that for all comparable products.
I have a regular old touch screen phone. If it freezes up, I take the battery out. My boyfriend has an iPhone. If it freezes he attempts to restart it but can't. It's now in pieces because "hitting it against" his leg was the only way to make it work. So, I suppose my argument is that so many people make it out to be that Apple products are so much more sophisticated but when something goes wrong you need to be reduced to tears and bashing it in? I know that's not a fair argument, but the argument itself is generally useless. Buy what you want.
As for everyone that complains about PCs coming with a whole bunch of useless junk, try buying one not out of a box! If you can't build a computer yourself, find a bored nerd, give them $700 (still cheaper than a Mac) and they will have some fun, and you will have a bad ass machine. I had mine built for about $500 (sans keyboard, mouse, monitor, and speakers), and my computer trumps most Macs I've worked on.
And no you don't have to buy a bunch of crap to keep it running smooth. I have one program keeping it clean, which is free off the MS website. I haven't had a single issue since I had the computer built at Christmas.
Having a Mac won't make your work better, and having a PC isn't selling yourself short.