Bigcommerce or OScommerce configuration for a flower shop

I am switching to either [login to view URL] or OScommerce (or some other suggested shopping cart) and need configuration help to set things up. I would like the shopping cart & check out to be similar to my current website [login to view URL] Must be smart phone & Iphone friendly and also support allowing the customer to designate a delivery date and include a personal card message for the recipient. I want some sort of floral/gift wall paper image around the outer border. I would like the delivery date in [login to view URL] to either default to the current date and/or have a calendar control so customers can more easily select their ship date (apparently they only have drop down box support for MM DD YYYY). I want to add fields for a personal gift card message and allow for the customer to select an occasion/holiday code (birthday, anniversary, christmas...) ## Deliverables Regarding the ship/delivery date defaults: I want a calendar control instead of a drop down box. As for default dates, I want the date to default to (current) if before 2pm and next day if after 2pm.