I've eaten at
Sams's #3 many times! Hugh portions and yup, it's busy but not impossible to get in. Sometimes we've been able to walk right in.
http://samsno3.com/
"
The Curtis Hotel" is 1/2 block from it on 18th Street and has decent food in their ground level restaurant, but is pricey.
http://www.thecurtis.com/
"
Syrup", at 999 18th Street right near the Ritz is very, very good. They are open for breakfast and lunch only.
http://www.breakfastdenver.net/
Speaking of
The Ritz, my son is a waiter there at
Elways and works the breakfast & lunch crowd. Expensive.
http://www.elways.com/Downtown/Menu/NewLunch
One of my favorite pizza places in Denver is actually
Old Chicago Pizza at 1415 Market Street. great pizza, salads and tons of different beers.
http://www.oldchicago.com/locations/denver-market-st
I wish I was going to be in Denver and could go to the RV Show and meet up but I won't be back there until early February. Have a great time!