I too have blues from Kathy (Halo). She is one of the only and one of the best. Do you have a blue or splash cockerel/roo?
If so, I might suggest using a very nicely typed Barred or White Rock if you feel you need genetic diversity
Mine are also Halo...Yard Full O'Rocks has it...if you stick with only blue you have a very tough time getting a real high quality..Cross to black or white to improve the blue.Splash isn't very hard to find...in my yard
and they tend to have better shank color than the blue's.
I'm looking for some high quality show prospect Barred Rocks if anyone has some chicks or eggs give me a yell..or a PM