With another important detail left out at the moment I realized that with a switch needs cables to connect to the computers. These cabels need to be ethernet but dont have to be Category 6 (Cat 6) which is specialized for gigabit ethernet. However, although Cat 5e are not officially rated for gigabit ethernet they do provide a very close speed with a small difference. They are 2.50 for Cat 5e and 3.80 for Cat 6. I think that there will need to be around 40 cables but The lengths will vary.
http://www.networkcablingdirectory.com/articles/structured-network-cabling-id_1151.htm
http://www.monoprice.com/products/subdepartment.asp?c_id=105&cp_id=10208
