What is the going rate for Linux/Unix support these days? I've been working actively with it for 17 years, am LPIC-3 certified + a whole bunch of other certifications. Have built and supported multi system clusters etc, I've done high level support for banks, large conglomerates and the like.

I'm thinking of going on my own now, the company I work for at the moment is hiring me out at 4K an hour, is there someone else in the industry that can give me a comparative rate? I'm just doing some research to check that if i go it by myself, what I could charge