Does anyone here know of somewhere that rents around Denver?
Try Mcair at Jeffco:
http://www.mcairaviation.com/home.htm
I dropped in to check out their fleet once and it looked pretty extensive.
Unfortunately I have no first had experience flying out of there.
If you are willing to drive up to Boulder, Dakota Ridge has several planes for
rental including a Cirrus. (it's expensive but it was a nice plane to fly)