I read through Travis's e-book, and would agree that getting a reseller account with HostGator.com is the best bet. That way, you pay the single monthly price, and can host as many domains as you want/need.

Another added benefit is that Hostgator offers free WHM backend system, so you can setup your own hosting interface with billing and everything. It makes it much easier to manage your sites that way, and when you sell them, you can also sell hosting services at whatever price you negotiate.

If you aren't tech savvy, it is still good choice to pick the reseller plan. Feel free to PM me if you need help with this option.