Osaka Sushi (Colorado and Exposition) - Great sushi with a laid back atmosphere. Fun chefs behind the bar and a great owner who makes sure you have a great experience.
Best breakfast burrito: Burrito & Co on Wash, just north of 58th
Best breakfast: Snooze (I've only been to the Park Ave location)
Best Sushi (some of the best I've ever had): Sushi Den
for Thai, I like Wild Bangkok off of 16th and Welton, Saigon Pho and Grill has very good Pho. Melitas for Gyros. The other Las Delicias in north denver for mexican. Cafe Jordano at jewell and Kipling as well as 5 J's family restaurant, if you don't mind waiting, for italian
Sushi Sasa on 15th and platte as great quality. Proto's Pizza for the best thin crust in town and 2nd Beatrice and Woodsley as one of the best in denver.
The Cody Inn on Lookout Mountain has an awesome Sunday brunch and Tuesday, Wednesday and Thursday night they have a $10 menu that's really good. Cafe Jordano has a well deserved reputation. The Chinese place next door is really good if you get there and the wait is too long. Bella Bistro in Arvada is kind of pricey but they do a good job.