Join your nearest club and see what all the people there are using.
Spend time asking to look through and try as many different scopes as possible, then decide what your budget is.
Most popular are likely to be Sightron S111 10 - 50 and (Big) Nikko Sterling Diamond 10 - 50.
As Gary said, around 32 mag is usually considered the minimum to get a shallow depth of field and therefore accurate range finding.
"I'm your huckleberry, that's just my game"