M.F.
My son just had his adenoids out by Dr. Alan Murray in Coppell. He's in practice with another doc at ENT for Children (www.entforchildren.net). They are WONDERFUL. Patiently answered all of my questions, were attentive to my son, and provided me with all the necessary information. His surgery was done at the Plano Pediatric Surgery Center, and that was a great experience as well.
As far as repeated strep infections, you should Google strep throat and/or tonsillitis. From what I understand, some people can become "colonized" with strep, and those are the folks who get it year after year. I don't know if removing tonsils will help it, but the ENT should be able to tell you that.