SSS,
I think Jake has it right in matching the bull to the heifers. Along with the heifer registrations, if you have any specific traits you care about more than others (BW, WW, YW, Milk,etc.) that would be good for him to know too.
Like you, I just recently got started in the reg. Angus business. Several people I have spoken with (some on the board as well) posed this question in one form or the other: "What is your herd goal/objectives?" This was a really good question and caused me to give serious thought to what I wanted to accomplish with my herd. As a result of answering this question for myself, I chose to go the A.I. route since my herd was not all "EPD balanced/uniformed" and no one bull could produce the traits I was after paired with all cows.
Not sure when you are planning to get the bull, or when the heifers will be ready to breed, but you may want to give some consideration to calving season if you haven't. My past experience suggests summer calves have a tough time in Texas.
As always, your mileage my vary.
Good Luck!