Like I said, I haven't seen any of the other 44mag scopes recommended at RFC, so you'd be on your own hook going for one of the others different than those 2 I mentioned earlier. Another point is the ATV is more suitable as far as size is concerned specially for the capability of a 17M2, but the 17Hmr can benefit from a 6.5-20x, probably just depends on what you intend to do with it and your shooting needs For a carry rifle and hunting squirrels, the ATV would be my choice, but if you're going to shoot a lot of paper, the 44Mag would probably be a better choice in 6.5x20x. Haven't seen much on the Alpens, what little I have seen was good, not that particular model, though, FWIW.
Tim