Fireworks is a good option, with pages and hotspots with browser export. Easy to create mid-high fi mockups, much faster than in photoshop for prototyping and user testing.
Faster to learn also.
Any chance you looked at Saasy or any of the others on the matrix? Tr http://saasy.com/matrix.php Trying to choose a vendor now. I've heard good things about Spreedly also.
Here's a start to your cookbook: http://fireworks.smashingmagazine.com/2012/07/03/interactive...