NEED WEBSITE

I am looking for someone to create a website that has a page in which our clients can go and plan an event. This page will need to be interactive with capabilities to change, edit, calculate for the enduser. We want them to be able to plan their own event and figure the costs for each item and the total once they finalized their event. We are an event planning company, we want someone to go on line registar themselves then be able to figure out using this page the cost of doing their event. The page will have menues for listed items and each menue will have a calculator that calculates the figures based on the selected amount of items. This page will be something like travelocity, expedia.com. but for party planning. Catagories we will need: Number of buses and the cost total for what is selected from 1-20 @ $480 each. Number of staff from 1-30 @ $20 per hr. DJ @ fixed rate of $300 Coordinate fee for parties of 150 or less @ $150 and for larger events @ $250 Select list of venues Amount of people Date We can email interested parties a list of similar websites using such applications.