I'm buying a horse I can do barrels with. Nothing super competitive but I'd still like to win every once in a while

. Now, I can not afford to buy a finished barrel horse or even a started one really. Any tips on how to know if a horse could have the potential to be a good barrel horse? I can only afford one more horse. What if I get one and find out later on it hates to run or something? I'm really scared/excited about making that final purchase. Any advice is appreciated. Thanks!
Ps I have another thread with horses I'm interested in. Maybe you experienced barrel racers could take a look and tell me which one may have the potential?