Jake,
I've been looking at both Macs and PCs for an editing station and while all of my experience and background is in PCs the Macs look very good. My lack of familiarity is the only thing that keeps me from going that route. Well that and my software is all PC based.
If you're familiar with the Macs I'd just stay with them. As the others said that is kind of the gold standard for editing anyway.
BTW, I like your setup. It sounds just like mine.
