Basically so just so you can have a think i will create the initial layout of the page in html and ill create the initial widget divs using html and css.
I will also create the panel which will have checkboxes for each widget and a save button so that the user can click which widgets they would like to see and click save to save and display the widgets.
Then what i need someone to do is build the registration system so that a user can register then login and i will need the coding to make the widgets movable within a contained space and for it to store and save the users preference.
So if you can email me with how long you expect this would take to code up and how much it would cost us then that will get the ball moving.
my email is 