I do run Linux on 2 of my other boxes, security updates are meh. Not too worried about it. Most vulnerabilities exist because people click dumb stuff on the internet, or don't have a working ad-blocker. or they open something in a non-web based email solution. so yah...
Haven't ever had a problem with security issues regardless of my machine unless I purposely clicked something I knew was going to be an issue, hahaha.
On the question of linux, is what you're talking about able to run .NET (XNA framework / DX) stuff? or would WINE be required for all that.
Last time I tried to use that stuff it worked until I wanted to try and play with something that used XNA/.Net - mono just wouldn't suffice because of the proprietary code the games used.
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xexorian - yes I'm a bit anal about keeping my UI clean and functional.