Trying to decide if Pro Sites is right for me

Hey there,

I am setting up a multi-site and am having trouble finding the right tool. I need someone signing up to be able to confirm that their name is available and fill in some forms that will email me the information and create the new site once the payment is processed. I don't need a lot of the stuff that Pro Sites offers and I don't see any way to set it up to allow me to create custom fields to fill in or an area to upload a document.

Is there any documentation on this plugin? Is there another plugin that might be better?

It seems like right now I would be fine with something like Gravity Forms except that I need the site to go ahead and be created so that there is no double assigning of the domain. Any thoughts would be appreciated.

Jason