well, Trophy potential is pretty good in some areas, I believe you have to hunt with a "hunter host", so you have to hunt with an Alberta resident. Lot's of the good areas are draw only, and im not sure how non-resident draws work. Lot's of the areas that are non-draw will have lot's of hunting pressure but still have good potential you just have to hike away from the roads. I believe that you can as a non-resident alien can get you hunter host to buy an over the counter tag,
Hope this helps a bit,
Post on the
www.albertaoutdoorsmen.ca message board there is a Game wardern that routinely posts there and answeres questions such as these.
Chris
I would recommend using a guide service though.