Some of my personal favourites in Toronto.

http://www.terroni.ca/

Terroni has a couple locations. Atmosphere is informal and relaxed. The food is excellent.

http://www.tabule.ca/

Tabule is a great little Lebanese/Middle Eastern restaurant located just south of Eglinton on Yonge. Reasonable prices, great food.

http://www.addisababa.ca/

For something quite different. Addis Ababa is a cozy Ethiopian restaurant on Queen West West. Wonderful cooking.

None of these restaurants are fine dining by any means but they all serve great food and are nice places to have fun with family and friends.