Just finished my second website working with Wordpress. The first website I done was my own. I had to keep the design of my website simple for the first time using it because I didn't know much about how to customize wordpress, but with the creation of another ([link]) I feel like I've developed a lot more knowledge of the system and how to change/add/take away things.

Got another client lined up now to do yet another website using Wordpress. So I was just wondering to anyone out there that reads this and has a bit of experience in the field, how much someone of my design level should charge for my services?
It's really hard to figure out when I have no benchmark to compare against. Perhaps a bit of industry research is required!

I'll update with my findings if they are of help to anyone else in a similar situation.
Links, advice, anything is welcome.

Cheers!