I did something similar for my parents wedding anniversary dinner. Paper Source (there's a store at Chicago & Franklin & a couple more around the city, website is
http://www.paper-source.com) is where I picked my cardstock from - they have a great selection of colors, including some very pretty shimmery metallic cards. Paper Source also has design & printing services, but I just did the design myself & it was much cheaper to have Kinkos do the printing. Kinko's was great about testing samples of the cardstock in their printers before I did the whole run (be careful, some cardstocks are too thick to play nice with certain printers & the coatings, if you have a special paper finish, is often only compatible with commercial laser printers).