I can understand why Apple is neglecting this segment for financial reasons but I do think they're slowly losing their exclusive cachet with the creative set.
Edit: misspelling.
Nowadays you don't even have to worry much about that - there are high quality, in-depth guides that will walk you through the entire process step-by-step, if you need them: http://lifehacker.com/5841604/the-always-up+to+date-guide-to...
While this box has held up fine for my OSX work, it's getting long in the tooth for Windows gaming. Now that Mountain Lion supports high end graphics cards like the nVidia GTX680 out of the box, I'm looking to build out a new Ivy Bridge based Hackintosh that I'll also boot into Windows for some high-end gaming.
But maybe I'm lucky because any of the current iMacs are more than powerful enough for my needs.
His machine is entirely built from standard PC parts from Newegg or some similar vendor. He said he did a little bit of upfront research on components to make sure they were supported but that everything in the box is pretty standard.
That's what happens when the Mac Pro product line is allowed to stagnate and run 2-3 year old parts. The difference is infact moot, and that's a damn shame. =[