Bontrager Race Lite Hardcase in the back. Maxxis Dentonator in the front. It's because they came on the bike I bought and they are decent tires.
Before that I had some Hutchison Equinox tires that were red. They kind of matched my CAAD9, which had some red on it.
I also bought some Forte GT2 Road Tires. They're cheap and decent for my commuter bike.