Toby:
I have worked projects on and off through an agency (Creative Circle) over the last 7 or 8 years and the $ hourly can be a pretty big spread. I have told my primary recruiter my dollar per hour range and they tend to not even contact me unless the hourly in their position is in my range.
I have seen a few on LinkedIn and other sites (like Creative Circle) where they have had kind of your #1 and #2 (basic & medium WP stuff like we have a website, but need help fixing/improving/etc or we need help fixing visible errors on our website) and the range has been $30-45 per hour. When you get into more of the full site development or working as a contractor at an agency, the hourly goes up but the expectation of experience level is much higher.