Alaskan- I dont own either so this may not be of much use to you, but I do like optics. Two years ago I bought a Nikon fieldscope 15-45x60 from Cabelas for around $750. It was a great scope, but a little pricey I thought, for what you get. Then I bought a Bushnell Elite 20-60x70. I like it, its nice and clear at 20x and sometimes 30x isnt too bad. It is pretty much worthless beyond 30x however. Images get bigger but not clearer, and do get darker as well. The bushnell was around $450 and seemed pretty comparable to the nikon. I wish I had just bought the 80mm Bushnell with interchangeable eyepieces, and then went with a 25x or 30x fixed. I have always read that a fixed eyepiece will outperfom a zoom set to the same power. Since everything I've tried is not much use beyond 30x anyway, the zoom is kind of a waste. BTW, I tried the Leupold too and was expecting a little more for the money, I thought the nikon was better for about the same price (no offense!) and all the reviews i read were similar. Nice compact size though.
What I'm getting at is that if you want more power I think you will be dissapointed with anything less than an 80mm objective at least where fine details and low light are concerned. I read until my eyes bled on some of the birdwatching sites about optics, those guys are really picky. They have some very detailed reviews on them. Basicly there is a physical law that limits the resoution ability of a scope based on the objective lens size, which is why you rarely ever see scopes with anything more than 45x in the 60mm class. You may already know this stuff, if not maybe I've saved you some researching.
Granted, the added 5mm of the Swarovski 65mm will help some, as well as the increased quality of that brand, but I think if it were me I'd go all the way and get the 80mm. I know you hike alot, so I'm sure the extra weight would be the deciding factor.
I would LOVE to have any of the Pentax, Lieca, Swarovski, or ziess 80mm scopes, just never seem to have that much cash laying around!