Cross breeder 1,
Since you are wanting to keep back replacement heifers and will also be selling calves at weaning, I would likely go with Astro. He has acceptable CE and CED EPDs, has the highest weaning weight EPD of the three bulls you listed, and also is moderate for milk. I have not seen any Astro progeny in person so I can't comment on their structure, muscle, etc., but the few reports I have heard on the bull are positive. Hopefully he will sire daughters with good teat and udder structure. This is something I would quiz producers on who have Astro daughters in production.
Though I have searched for years I have never found a perfect bull in ANY breed. One EPD that concerns me a bit for Astro, is that he does have a -.2 for scrotal circumference. As you may know, there has been some research that shows a correlation between a bull's scrotal circumference and his daughters fertility (daughters out of big scrotal bulls tend to be more fertile, and daughters out of bulls with smaller SC tend to not be as fertile). Another one ofAstro's EPDs that I would also like to see higher is REA, but since you aren't selling cattle on the grid, this likely won't impact your pocketbook too much.
Regarding Top Brass, he seemed to be fairly popular early on but most producers quit using him after one or two calf crops. I don't remember exactly why, but seems to me that that Top Brass calves in general lacked overall thickness. Also, if his milk EPD is very high, and it is difficult for cows in most parts of North America to maintain body condition and breed back if they are giving so much milk.
We only have one Extra Exposure daughter, so my experience with this bull is minimal. The cow we have has a very nice udder and teats, but is a bit light on the mlik, as Extra Exposure's EPD indicates. However, if you are in short grass country this bull may work well for you.
Best of luck!