A question about range finders

[sure as shootin']

I've been thinking about getting a range finder but I was wondering which one to get. I mostly hunt deer and I rarely have shot them over 150 yards but eventually I know once I retire and have more than my weekends to hunt I'd like to get away to shoot elk which would likely entail longer shots.

If I am going to get one should I get one that ranges out to a 1000 yds. or would a range finder out to 600 be just fine?