I have a lot of experience scraping, and with the webbrowser control in .NET. Mostly I write my own custom scrapers for large projects. I haven't used the agility pack, but I just checked it out on codeplex after reading this post and it is straightforward enough that I could work with you on a project using it with no problem.
You didn't specify how many hours a day/week you wanted help with this. How do you want to handle that? And as far as milestone payments, daily, weekly? Let me know, I'd like to help you with your project, just want to iron out the details first.