The first time I bought chickens I got the "brown egg layer special".
It was a combination of Rhode Island Reds, Barred Rocks, Buff Orpingtons, White Rocks, Wyandottes, Australorp & Brahma. They threw in an Indian Game hen as well. I gave away/traded for 1/2 of them, and kept at least one of each. (more Reds because I got a Red roo) I have to say- it has been a great learning experience. It exposed me to all of those breeds and they've given me tons of eggs- and a few chicks.
I'd recommend doing the "mix" if you are interested in utility birds (not show birds) and you'll learn as you go what you like/don't like about the different breeds. Good luck-have fun!g