Cherry hills sushi Co is great but might be a bit over of your price point.
Kikis japanese casual dining is also great, it's cheaper and has other things besides just sushi but admittedly I don't know if the have rolls. It is a pretty authentic place however.
I had Hapa in Greenwood Village this past weekend. It was not my favorite but they have multiple locations throughout the metro. It might have just been the choice in rolls.
I honestly prefer Go Fish in Westminster. They have other locations across the metro as well.