Magento Installation with Extensions

This project is to create a new magento website. The site will quote prices for boat related parts. We will specify/ supply the basic theme but obviously want the logo added and some basic tweaks. The initial project is to also add a series of 5 basic extensions, all pre-paid. Added to this we are looking to add a multi vendor shipping extension (TBC) and also a quoting system likely to be cart2quote all of which we will purchase in advance, once a freelancer has been hired and it is the confirmed best path / extension to take. We will then require 7500 products which are in an excel spreadsheet to be added to approx 45 categories with approx 50 suppliers and all products linked to a default image. The category / shipper id's will need to be added to the excel spreadsheet prior to database population. Thank you for bidding, please provide examples of your other work. This will be phase 1 on an ongoing project. Regards Andrew