All cotton polos make you look the same: like a college frat boy on a beer budget.
I only wear polos made of silk/cotton blends because they drape better than 100% cotton.
Chinoguy, a lot of of the official wisdom/groupthink on the board is oriented towards wearing a suit and tie every day. Then I guess the next formal answer would be an OCBD with the sleeves rolled up, I think. But if that isn't your attitude then there's nothing wrong with a polo shirt (without a big logo on the chest!).