In general - good feet, level back, leg at each corner, good gigots, nice temperament
On EBVs I like a good mark for easy lambing, lamb activity, and for growth rate of lamb once born. I like a
terrible mark for birthweight - I like small lambs that are very active and grow very well once they're born.
But remember the 'E' is for 'estimate' - they are educated guesses
- unless you are buying a proven tup and can see his lambs.
For pedigree breeding, you'll also be interested in the maternal characteristics he passes onto his daughters.
Charollais-specific, for up here I'd want a carpet on his head, which mostly translates into the lambs not being born too bare, but where you are I imagine that facial wool is not required and indeed is probably undesirable. I'd be looking for a well-filled but not over-ballooned backside, and shoulders narrower than hips. (These characteristics in terms of ease of lambing and the meat lambs he sires, rather than with any reference to the breed standard.) Given that you probably get more sun than we do, you'd probably want him to not have too much pink skin showing, or he'll be getting sunburnt all the time.
Oh, and one that isn't too tame. They grow
big!
It's great fun choosing a tup, and waiting to see his first lambs next spring