Hey Brad, best of luck on your upcoming trip! I just got back from a 6 day hike in RMNP earlier this week. Your list looks pretty solid, but here are a few considerations:
The mosquitoes are out at higher elevations so I would consider a head net if you are using a shelter without bug protection.
As far as quilt and insulation that is kinda a personal thing, I would just be sure you have enough to be comfortable down to the thirties.
I brought rain pants and they got some use, the temps can drop a bit when storms come thru. I didn't bother with rain mitts tho and never missed them.
You didn't specify what type of stakes your using, but be aware that the rangers require you to camp on designated sites while in the park which is most of the time going to be hard rocky ground, I would suggest something that you can drive with a rock like an Easton peg or groundhog. You may want to take that into consideration in regards to your choice of ground pad too, I brought a neo-air and never regretted the weight for just that reason.