Diamond G, This is a real good topic, with lots of good replies. From my 16 years of experience as a MA breeder and our 11 years of showing, I say there is no right or wrong answer to your question; only opinions. Opinions are what the Show Ring is all about. The judging is completely subjective! Of course, the same guidelines are used by all, but each show rests on the opinion of one person, based on an always changing criteria.
A "Big Name" breeder I know well has two sales each year. I have been watching closely for many years how these calves(mostly heifers) perform in the showring. Rarely ever does a calf excell that was not kept by this breeder to be fed, fit, and groomed every day by his staff. The majority of the best calves do stay with him at a cost which might surpass the auction bid by the time the calf ends her show career. This is proof positive that no matter how good a calf is both genotypically and phenotipically, Professional daily care is a great determining factor of show ring perfomance.
The best advice I have to anyone, is to pick a breed, and get active in both the State and National organizations of your breed. A Junior exhibitor(and parents, grand parents, uncle) can absorb more about this "business" at one Junior National Show's week of contests and exhibits, than will be learned in 5-10 years of showing at the County and even State levels.
Proper selection is extremely imporportant when buying a show calf. At a major sale, it will probably take at least $8000 for that "winning" heifer. The same can be purchased from a breeder for $2000 - $3500. In Texas and Okla. the MA breed is plentiful. At any bigger show, the difference between the 1st place calf and the middle of the class is usually determined by Feeding, Fitting, Grooming & Showmanship; not the price of the calf.