Tiogap, I'm guessing from your image collection that you might be from CA and used to climbing in the Sierras? If so, our definition of Class 3 is not the same as yours, and our San Juan rock is about as different from Sierra granite as you can get. Imagine your idea of Class 3 on the scree slopes of Keith, where the Class 3 holds are just as loose as the scree they're embedded in.
I haven't climb too extensively in the San Juans, but I did climb Wetterhorn this spring and it was definitely the most interesting of the dozen or so peaks I've climbed in Colorado... it seemed like a solid Class 3 Route by Sierra standards... and a fairly short day-hike, making for a good fall climb... plus, you can always try your hands on the Matterhorn (Class 3?) or Uncompahgre (Class 2?) if you're looking for a bigger day. Good times.
I don't have any specific suggestions beyond what has already been posted (Sneffels' SW Ridge is a really fun climb), but thought I would share a little tool I created that might help you find more options.
If you go to my summit list, you can filter for class and mountain range (among many other variables).