Choosing theme at signup

I'm slow today... I know we talked about this but I can't find the thread.

I need the option for people signing up for a new site/blog to select the template they want to use during registration process. I know we covered that and you guys are thinking it over, but I just want to add that having a thumbnail preview of each available template with a radio button to select would really enhance the idea.

as always, Keep up the good work, and be encouraged!