There have been quite a few winning steers over the years in Canadian steer shows that were about 1/4 Highland blood. Highland crosses are exceptional in carcass competitions as they have excellent marbling and cover so well. Another breed to consider are the Galloway especially if you want a good bunch of clubbie moms. Some of the winning Galloway bulls and females are really quite awesome, and they cross real well with Angus cows to give you a black moderate framed female that milks extremely well, and puts some extra hair on her calves. Breed these cows to some of the clubbie bulls, and you could be off to the races. I have seen some of these calves and they are actually quite sound in their make up besides having crazy amounts of hair. As for raising these cows in southern clims., I know there are lots of Galloways in this country that used to sell to Texas. Both the Highland and Galloway are very hardy animals that probably have more ability to adapt to their situation better than any other breeds.