Your mom's donuts is one popular spot.
My recommendation is to get there early or prepare yourself for a wait. They make a wide assortment of donuts each morning and once they run out (or get close) they'll make another batch. The wait is totally worth it, but if you're anything like me (grouchy without coffee), I'd recommend bringing a traveler of coffee since the line is usually very long.
All of their donuts are great - the texture and flavor are always on point. I'm a sucker for traditional donuts, so I usually go chocolate glazed, whereas my wife likes to try the fancy ones, like the samoa.