The Hyatt is the hotel near Crown Center. It s pretty nice, and not far by cab from the Power and Light District. Maybe 5 minutes or so. There are several other hotels that are even closer than Crown Center, within walking distance to the bars in the Power and Light District. You could check out the Hotel Phillips, Marriott Muehlebach, the Hilton President, and some others. If I were you I d just look on priceline for downtown hotels...that way you could just walk to and from the bars.
The Marriot Hotel in Downtown is walking distance from the Power and Light district. http://www.marriott.com/hotels/travel/mc��