I would get 6 of the High Flyers, 3 pairs, I assume owner would know which are male/female. I don't see these as being sick.

Priced reasonably as well. I also don't think owner is trying to dump sick pigeons on anybody.
I'm not one to like, or want Birmingham rollers, but if you like them , then get some as well.

My reason for not getting rollers,,,,,,, would not want them mixing with my homers.
High flyers can also mix with homers, but are easier to separate. JMO
Peeps that keep Birmingham rollers seem to focus their interest on rollers. Just my observation.