How do I create an online membership form that allows members to fill out and update their own profile?

I need a CRM-like database that is enabled online. Here’s what I would like to do:

Create an online form that would allow members to enter their profile information, upload a photo, and attach a file. Later, they can get on to update their profile without having to fill out the whole form again (like google docs forms would).

Filemaker seems too complicated, bento looks cool but isn’t available online, and google docs doesn’t allow them to update their responses.

What would allow me to set this up?

Thanks for your help!