Hey haleyd,
you should use edmunds.com they are the best! im in the same, well almost, situation that you are in im lookin to buy an ss buy dealers are overpricing them. just remember a little research never hurts. with the options you listed this is the invoice: $26,235 which is what you want to pay around. what other are paying: $26,970. Try this website its where im getting the numbers from:
http://www.edmunds.com/new/2010/chev....html?action=2