Didn't read all the posts, but wanted to point out you'd have to be eating anyway, whether at home or Disney. So eat! I would take that out of the "pricing" equation, because if you do a Priceline deal for a Rental car, you can drive to Target and/or
Walmart, Winn Dixie, Publix to get groceries and eat as you normally would. If eating at Disney, I would absolutely eat Counter Service, as most TS restaurats will require reservations anyway, and at this point it would be hit or miss if you can get a ressie or not.
Use the DDRD for tickets. Get a cheap rental car, eat in, and do a quick garage sale or sell some items on CraigsList for some quick cash. Also with the rental car you would also be able to get to the Outlet Malls, I've never visited them but heard you can get some great deals on Disney souviners.
Good luck on your decision, but at this point if it were me, I would go. You've got most of your bases covered, with the exception of eating, and like I said, you have to eat anyway, at home or in Florida! Have fun.