It really depends on your abilities.  A lot of people will say, "I have lots of experience", and what that means is that they've built machines for their grandmother, built their own machine to play quake, and know how to maybe network a few of their home computers.  If you have *real* experience, that is, experience supporting an enterprise, then $16 is a joke.  I don't know of a single professional in my area (Tulsa, OK) charging $16/hr.  Rates are anywhere from $75/hr-$150/hr.  Keep in mind again, that these rates are for serious professionals.  Our systems engineers do everything from server builds, exchange configuration, cable runs, router configurations, software configs, ad nauseum.
On the other hand... if you're young, then it will be difficult for you to demand a high rate.  If you've never worked in an enterprise, then charging a high rate is no less than thievery, I don't care how many certifications you have, or how much you think you know.