A unix-like environment is great but Linux isn't very good when it comes to screencast recording software and general audio/video/image editing.

So as a developer who also dabbles in the above you have 3 options:

1) Hackintosh

2) Pay double/triple the cost for a real Mac with worse hardware

3) Run Windows with a "seamless" Linux based VM and spend 99% of your time in the VM (this is what I do but honestly, it's not ideal because despite having a fast machine it doesn't have that "liquid smooth" feel to it even tho it's fast)

If you happen to enjoy games too then generally #3 is your best bet. Btw driver support for Linux isn't that bad anymore. I picked out standard parts (similar to what OP did in his blog post, but not his parts) and everything worked out of the box with Linux.