scott,

I'd lean 42mm if low(er) light capability is compulsory - particularly in this price range.
Seems the Meopta Optika 8x42 was built to compete at the precise level you're looking.
Based only on experience with other Meopta products – and feedback from others whose opinions I value, Meopta seems to always outperform the given price point it resides.


[Linked Image from i.imgur.com]

WWP53D