Mobile phones + contracts

Hi all, What I have in mind is a OSCommerce shop with the following functions: A visitor can make a choice out of Mobile Phones, Contracts seperated in with and without phones and renewals also with and without phones. When you pick a phone it should be possible to see (by example) three worksheets (Phone only + description, Phone + contracts and Phone with renewals). When I change prices it should be done by changing only one time for phone, contract or renewal. All combination prizes should change automaticly. Who is able to do that for me in OScommerce. Second question is about design. Not the most important thing for now.. Who is able to make a impressing design for the mobileshop?