How much to Charge?

As a beginner freelance illustrator I've never been more daunted by what to price my work. Do I charge what I want and risk scaring my client away or do I undercharge to "build my portfolio". Lately I've been erroring on the side of charging too little and have been wondering if my fee even covered the supplies (Yikes!). However, I have been lucky enough to find some posted rates for illustrators on the "chewingpencils" blog by Matt Glover

Australia
The MEAA (Media, Entertainment & Arts Alliance) sets recommended rates for Australian artists. Only members have access to the site directly, but the Australian Cartoonists’ Association has kindly reproduced the rates

here

The Australian Society of Authors lists rates for authors and illustrators on their site

here

England
The AOI (Association of Illustrators) in London has a very comprehensive list of rates on their site

here

Ireland
The Illustrators Guild of Ireland list their rates

here

South Africa
The South African Freelancers Association has a list of rates here:

here

America
The Graphic Artists Guild has a handbook on pricing and ethical issues for sale on their site

here

I don't have much for Canadian Illustrators but I know Canadians contributed to the American: Graphic Artists Guild Handbook for Pricing and Ethical Guidelines (link above).

Individual People's Rates:
http://www.curtoons.com/logo-design-rates.htm
http://www.unlimited-ideas.com/cost.htm
http://www.electriceasel.co.uk/Prices.html