I've been given a whole lot of **** about the fact that I use a Mac. Look at the specs, and it is actually is better than most of your Windows boxes. My Mac plays any game I want at 2560x1600. It also runs professional animation software very well. I emulate x86 Windows to play Windows games; yeah, there is a severe CPU performance hit, but the GPU isn't emulated, so it isn't that bad.
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Specs
TITAN BLACK at 1400MHz core, 2000MHz RAM (got a TITAN BLACK instead of a 780Ti, because I don't like intentionally crippled products. nVidia intentionally crippled the 780Ti's FP64 performance, and that pisses me off.)
Two 970MPs at 4.5GHz, 1.5v (Combined, they are about as fast as a 4670K at 4.5GHz)
Two 1TB Samsund 840 Evos in RAID0 (I like fast transfers of huge, sequential files)
1000W Internal PSU (I use about 750W of it. (600W taken by CPUs, 50 by RAM, 50 by SSDs, 50 by general components))
500W External PSU to power GPU (internal PSU only has 1x6-pin wire)
64GB of DDR2 at 1066MHz (I run a web server, and the bragging rights are nice)