@ BuoyToy:
Mine isn't a gaming system. I built it for 3d modelling/rigging/animation, and image/sound/video-editing, and it enables me to have several large software programs open at once (ie. photoshop, After Effects, PoserPro, Soundbooth, etc.) rather than having to close one application before opening another. I can instantly switch between programs without waiting for load-times. This is a massive time-saver in a production pipeline.

Nothing short of a full desktop pc would suffice for my workflow. Laptops, tablets, and cel-phones are too limited, functionally, for my uses, and are all disposable hardware. I can rebuild my system as my needs change. (Note: I've been using the same tower since win98.)

System: (in an old windows 98 ATX-tower - lol.)
SPI MagnaGold 750W power supply
ASUS P8B75 motherboard
Intel I7-3770 LGA1155 (3.4 ghz) quad-core processor
ASUS GTX-680 (2gb onboard RAM) VGA Graphics
32gb Vengence DDR3 RAM
Dual 25-inch HP monitors
Dual DVD-RW drives
4+ TB storage (multiple drives)
Kinect Sensor

Software:
Windows 7 Professional
Adobe Production Premium Suite CS4 (Photoshop, Illustrator, After Effects, Premiere, SoundBooth, Flash, Media Encoder, Encore, OnLocation, etc...)
Poser 6, PoserPro (7), PoserPro 2012, PoserPro 2014, PoserPro 2014 GameDev (SmithMicro)
Daz Studio (vers. 1.2 - vers. 4.8)
Unity Game Dev
Mimic Pro
Pixar RenderMan Pro Server 19
Hexagon 2
Blender
GifMovieGear
Easy Hi-Q Recorder
Notepad 2
Kinect for Windows SDK (3d motion-capture)
ReconstructMe (3d scanning)
Paragon 10 Recovery Suite
etc...

For everything else, I use xp.