Niro's is a staple.  Quick, easy lunch that hits the spot when you're feelin like gyros.  I'm not saying it's the best gyro I've ever had, nor am I saying it's the cheapest (around $9 total), but it gets the job done.  

I usually get the single gyro meal when I go.  The fries are the thick cut super crispy kind, and the gyros are cooked well, with plenty of sauce (not sure what people are saying about it being dry, my hand's are always a mess after eating one of these), and onions and tomatoes to boot.  Great in-and-out spot if you didn't bring lunch to work on any given day.  Plus, the owner is always really nice and friendly.