Orange tabbies seem to be laid back and mellow, from what I've heard. But I don't have any. Make sure when you're looking, you check out their eyes (make sure they're not runny), their noses (if they're running, chances are they have an Upper Respiratory Infection). Most shelter cats DO have URIs. It's a fact because of all the over crowding in the shelters. Also check for ringworm. Any bald patches on the cat, beware. Ringworm is also common in shelters and is VERY contagious.

One word...let the cat pick you! You'll know who's going home with you. If you see one that puts their paws through the bars CRAVING attention, meowing like crazy, you'll know that's the one for you!!!

Good luck in your search.