I'm a member of the National Press Photographers Association (NPPA) and I find their costing and pricing methodology for photographers to be fair and transparent. You can see it here: www.nppa.org/calculator
My figures work out to...
$140 per hour
This includes tax and travel up to an hour from my home. This is irrespective of the assignment or 'theme' and represents a basic fee for an agreed number of digital photographs, not including requests for special work ups / prints etc.
In other words, let's chat. I can make most things work. This is a partnership, a collaboration between us.