Mine was free, the best birthday present I ever got. She's sitting next to me right now, giving moral support, just as she has every day for the past 13 years.

Unless you're allergic, a hacker should go to the humane society, pay the 50 bucks, and save a life. Don't worry which one to pick, they'll pick you. You'll always have company, and when you're out, they'll take care of themselves, always ready for you to return. Dogs are great too, but they need much more attention.

Given the number of people who are allergic to cats, getting a cat as a pet has always struck me as somewhat inconsiderate/antisocial. But maybe potential discomfort to guests is outweighed by the benefit you derive from having a cat.