I'm a low tenor/high baritone! A song that works really well is "Johanna" from Sweeney Todd. It's written for a tenor role in a baritone range intentionally, and I love it :P also, for something a little bit newer with more acting range, I've used "Larger Than Life" from My Favorite Year.
"I saw Pavarotti play Rodolfo on stage and with his girth I thought he was about to eat the whole table at the Cafe Momus." - Dollypop