I have had calves from or seen cattle from the bulls you asked about. I also saw 30B, 80C, 85C. This my opinion:
30B - follows the frame size of the cow, good udders, not big birth weights but not a consistent heifer bull, adds length, good volume, good females
80C - calving easy, moderates frame, udders not quite as good, nice rib shape and volume, good females, very uniform calves
85C- calving ease, throws quite a bit of color, good females
Ultra 8C - not a calving ease bull, throws more birth weight, frame and bone. Some people say he was the thickest of the Eionmor bulls, but I never saw him
I saw some really functional females out of 30B, 80C, and 85C. On the right cows they have some eye appeal, but tend to be not as clean fronted with a little more set to their legs. Ultra 8C cows were a little big for me, but I prefer 5.5 to 6.0 frame cattle.
Eionmor Marquis 86G is another bull to consider. He was eventually owned by Dale Studer. His mother was also the mother of 80C. She was a gorgeous cow, saw her when she was 12 or 13 years old. I used a son of Marquis as a herd bull, Studer's Trendsetter 31T.