Like a lot of things it can depend on your personal requirements & the lay of the ground that you shoot over, ie flat fenland where the individual fields are 20-30 acres might not suit the same kit I use in hilly rural Devon where there are hedges every 100yds.
I have a Redfield Raider 550 handheld and also one of the Chinese weapon mounted night vision rangefinders both of which work flawlessly.
In that case you need one with IR and a range further than the maximum range you shoot at! Otherwise you will never be able to use it at night and if you shoot longer distances than the range of the range finder it is going to be "as much use as the tits on a boar" to quote High Plains Drifter. This may alter the specification of the range finder you are looking for!