I had/have considered the nalgene with the cup but plastic just bothers me, the durability. SS I feel would just last better.

And on this subject, frontier filter or the frontier filter pro? The first is rated at 20 gallons and the pro at 50. I think I actually like the pro better because of the protective cap and bite valve. Plus you can set it up as a gravity filter. Then all I need is a Steripen and a normal filter (I will probably go with the hiker pro) and then I will have THAT part of the equation covered.