I third the parakeet motion. When I say 'parakeet' I mean a Budgerigar.
Budgies are great little birds. They're fairly easy to care for, and once tamed, they make great companions. They're intelligent, and they have personality. They can also be taught to talk, and learn all sorts of tricks if that's something you're interested in.
Cockatiels are a good choice, too, but my personal preference is budgies.