I don´t think this suggests you sell pizza slices at all. BUT you can do this so you are sure: click que FORUM link on top of the page, then go to "Contest Holder Discussion" forum. You can ask for opinions fro other contest holders and see what they think :) It´s always good to have other people opinions, from different ages.
When you select a winner, you can receive different versions of the same logo (like color background, white background, etc), no problem.
Please follow my suggestion and run a poll, I´m sure you´ll receive many comments from other people who are not in the field, and that´s the best part, because they are a small sample of the real audience :)
I´ll be around if you need me.
Thanks for your time :)