Re: leupold vs. swarovski vs. nightforce
Having never owned a Nightforce (have looked through them) I won't comment on them.
I have owned and used Leupolds and I now own and use Swarovski and Schmidt & Bender.
The Swarovski has a definate advantage in low light. They definately utilize the available light much better then Leupolds. I found them to be crisper and clearer as well. Also, they are a LOT less eye critical then Leupolds. I owned 3 Leupolds and will never go back to them.
You didn't say if you liked the magnifying reticles or not. If you do then you may want to look at a reticle that is real wide (outter posts). They can be seen well in low light conditions.
Have a good one,