I agree with KF acres. You need to decide what direction you want to go and your goals are should be thought out carefully.
I think that there are maybe 3 catagories of shorthorns, 1. show steers, 2. show heifers, 3 performance cattle.
1 show steers: As in all categories some of these cattle are not free of genetic defects, but there are some out there. Notable genetics include double stuff, kaba bloodlines and a few others. Today you might include some sonny breeding that has been crossed with double stuff lines or kaba lines. Proud Jazz, maybe. He has yet to prove anything other than light birth weights and easy keepers. I have nothing against JPJ. He just has yet to prove himself in the show ring. We might see some results this year. There are some others but proven bloodlines in the show ring and high sellers include Double Stuff lines, KaBa lines and Sonny lines. don't forget color and hair is always important.
2. Show heifers. You can include all the info above for the heifers too. They do cross over. You can also add some lines that can't cross over to the club calf or show steer side. Trump lines are the most noted heifer bloodlines that were successful in the show ring and bank. don't forget color and hair is always important to most buyers.
3. Performance. Just play the numbers here. heavy weaning weights and go to the market. Most of these cattle just don't have enough style or look to be very successful in the junior show ring. Red solid colored cattle is important here. Roans will take a price cut at market. Some might disagree with me about their competitiveness, but I will stand on my ideas.
Here are some questions for your self to answer.
What is important to you. Showing or market
What is your most important goal. winners in the show ring, money in the bank, bragging about epd's
Is birthweight important to you. Maybe I should ask, do you have time to manage calving in cows.
Is color important to you. Depends what direction you choose.
PH and TH sounds important to you. This is the easy question to answer. Just know what each animal test and match accordingly. Make sure you fully understand matching genetics.
Is pure breds important to you. Looks like there could be several directions to go in the shorthorn breed.
After you choose what direction to go, then call someone that has been successfull in that area and aske them lots of questions.
I am sure a lot more can be added, but this should get you started.
I accidently sent this to KF in an email. Sorry KF