Hill Creek,
We've been raising Gelbviehs for over ten years and are very pleased with their fertility, growth, disposition, etc. We culled pretty hard early on and the resulting cattle have been easy keepers who don't demand a lot of groceries like an earlier post indicated; though there are plenty of cows in all breeds that require lots of feed to keep in condition.
We've had a handful of Atlas sired calves and they have been very inconsistent in quality...some really good and some pretty poor. I've heard similar comments from other breeders. There are plenty of other Gelbvieh bulls that I think you'll be more pleased with.
By the way, the last I heard Beartooth was out of the purebred cattle business.
As you begin your Gelbvieh journey, take time to get to know the breeders that you are interested in buying cattle from. Make sure that they have similar goals and raise their cattle similar to the way that you do (there are lots of pretty cattle in some of those pastures that get lots of grain at night after the prospective customer drives away).
Also, don't get caught up into thinking that someone is a good breeder just because they have fancy ads in the breed magazine, have a fancy farm (most likely made their money in something other than cattle), have won lots of shows, or are consigning cattle to a state sale (some of the worst cattle I've ever owned were bought early on in state organized consignment sales). Go to the farm, get to know the breeder, see the sire and dam of the cattle you are considering buying, etc.
Just my thoughts.