I have 3 conquests - 2 3.5x10x44mm's and 3x9x40 mm. My partner picked up a 3x9x50mm this spring. I see no appreciable difference betweenthe models, in terms of optical performance. Re: objective size and mounting all 3 of mine are now mounted with warne maxima med rings and bases. If you go with Leupold you'll require high's for the 42 and up objective size. If you go with the 50mm you'll require high rings in most mounting systems.

Like Stubblejumper my legal hours are the same and have never had a problem. I can saythey preform very well in minimal light, many times legal time isn't a lot of light up here. I have no doubts they'll work outside the parameters, if this is a concern to you.