I quote myself from another thread...Simple rule on optics - spend as much on the scope as you did on the rifle.
$0 with at least a 40mm objective - 50 to 56 will serve you better in low light.
I can't count the times where I've seen a $1,000 rifle with a $100 scope and the shooter just can't figure why the rifle won't shoot.
That being said look at Trijicon (a bit $$), Konus, Shepherd.
Cheaper end look at Vortex & Mueller.
Two simple tests for a scope -
1) Pick a distant vertical line - gently move the scope left and right/up and down and observe how the image changes -a good scope will keep that line sharp and bright at all times.
2) Just at twilight look at something dark (under the lowest branches of a pine tree works perfectly) - does the scope intensify the image, or is it darker than with the naked eye?
The next thing you need to figure out is what reticle you want.Thanks for the input. Thinking now about a Vortex adjustable up to about a 12 or 14x.