Well the thing that kinda sells it for me, is that you almost get a 2 for 1. You can actually install windows on a mac, and it will run absolutely just like a PC would run it, no limitations, no problems.. so if somehow you run into a situation where you just HAVE TO HAVE a PC.. You do.. but if not you have OSX, which is in every way shape and for far superior in every way to any version of winblows, smaller footpriont, faster, easier to use, more control, no need for antivirus.. the list goes on and on.
I havent looked at the other macs, only the macbook pro (which I already have) and the desktop pro, and you literally cannot go wrong performance wise with them, the "base model" pro desktop is still a monster.
Add to that the build quality and design of the systems, which just ooze class and beauty, and suddenly the outrageous price tag, does seem so outrageous.
Of course budget and even more so "how you like to do things" really count.. If your like me, and want to just buy one badass system every couple of years, and just use and enjoy it and not have to worry any cooling, or reliability issues... just have a powerful machine that works every time all the time with no hitches then the MAC has obvious appeal.
But if you (like many people) really like constantly tweaking and fiddling with your gear, over clocking, water cooling, constantly meddling and toying with things, which I understand totally is a great source of enjoyment for some people, the the mac is a poor choice.
I used to LOVE to over clock and push the limits and all that, but at the ripe old age of 29, I just want a turn key beast that will run everything I need it to and never give me any crap about it.. And I know for sure the MAC will do that for me, So for me it is worth the price.