OP, why does it have to be Summit? Based on where you ski and how often, I would guess you are probably in the low intermediate range. The good news is that pretty much any place out West will be amazing fun.
The issue with Summit is that you are going to a place with some of the most crowded beginner and intermediate slopes around, at a time that is fairly busy. Your of places to ski in the area doesn't sound bad- I really think you should have Loveland on your list for the giant intermediate bowls that make up most of the mountain- amazing fun! Winter Park also has a great intermediate bowl and a terrain that has very nice increments from totally mild to way beyond anything you will want to ski. Arapahoe Basin also has a good amount of above timberline intermediate stuff- I'm recommending this because it is stuff you can ski that will give you an experience you won't find in the Midwest or East.
If it doesn't have to be Summit, consider the Aspen resorts and Sunlight. Buttermilk is a great mountain for an intermediate, and Snowmass has a ton of terrain, with much, much less crowds than the front range. Crowds simply do not exist at Sunlight ever.
Durango Mountain Resort is another really good for an intermediate place that is off the beaten path.
Really, with the exception of Granby Ranch and Silverton [ruled out for totally different reasons], you can expect to have an amazing time at any Colorado ski area. Compared to midwest skiing they are huge and the snow is amazing.
Regardless of where you go, expect the combination of vert and altitude to own you and plan accordingly. Skiing 5-7 days in a row is tough, unless you are in exceptional shape, doing this non-acclimated will likely mean shorter days than you are used to. You also need to make sure your equipment is good to go- problems with boot fit can be pretty easily masked by a 400 foot mountain, but out West a typical chairlift at a major mountain has 1300-1800 vertical feet, and some have much more, meaning you will have to ski longer stretches without boot rest on a chairlift. If you have any problem with fit, get them sorted beforehand.