I would be very appreciate for you idea...

I am setting up a shop which sell flowers and gift baskets. For flowers, the cut off time is 2:00pm. If the customers orders the flowers by 2:00pm, our supplier will be able to delivery the flowers today (same day service). And if they order the flowers after 2:00pm, it will be delivered the next day. And for the baskets, the cut off time is 4:00pm, and all of them are delivery the next day. And we have 20 types of baskets, each one of them has different weight, therefore their delivery cost is different. The customers can chose the 2nd days delivery which the shipping cost will be cheaper. And if the customers chose to be delivery on Saturday, the shipping charge will be higher. In summary:

1. The customers can chose the delivery date they want.
2. The customers can chose the type of shipping they want..next day shipping or 2nd day shipping...
3. The script can have different cut off time.
4. According to the delivery date, the script can show a different shipping cost. Saturday is highest....

Which php shopping cart script can I use that has this kind of shipping function? We are using FedEx, what kind of function is this? Real time shipping? Or what? I am really having problems to know which script has this kind of unction. Any idea or help will be very grateful. Does anybody knows what script does flowers and baskets shop use?

Thanks.