Use what you want - I used one can kidney, one can white kidney and one can black beans. Great white north and pinto would be good to use as well, or go with 3 cans of just one can.
I usually find the canned chipotle peppers in the Mexican section of my grocery store. If you can't find it, mix together 1 tsp tomato paste, 1 tsp cider vinegar, 1/2 tsp paprika, 1/4 tsp cumin and oregano and 1/8 tsp salt.
If you can't get the Whistler Brewing Chestnut Ale try using any nut brown ale.