Like you my son has had a few surgeries done for his pulmonary stenosis. Since you need a pulmonary valve, I checked your profile, because for the most part (Unless they need on because of a Ross procedure) , people that need pulmonary valves were born with Congenital Heart Defects and usually have been having surgeries since they were babies or small children. DO you have a valve and conduit (usually dacron tube after the valve that goes to the pulm artery) Or just the valve? Most people I know that have a pulmonary valve replaced as a child also have a conduit because of stenosis in the pulm artery, but some just needed the valve.
I definately would check the Mayo if I lived as close as you do, as mentioned most surgeons, don't have much experience with pulmonary valve replacements, except IMO Congenital Heart Defect surgeons. (out of about 100,000 valve replacements each year only about 5000 are pulmonary) Also since this will be a multiple REDO surgery, you should make sure the surgeon has alot of experience doing MULTIPLE REDO surgeries, which can be trickier, but IF you go to surgeons who do lots of them, in MAJOR CHD /Adult with CHD Centers (which are NOT the same top hospitals for Adult heart surgeries, for example Cleveland always tops the adult heart center list, but usually isn't in the top 20 for CHD) Here is a pretty good list
http://health.usnews.com/best-hospitals/pediatric-rankings/heart-and-heart-surgery that beside ranking them, also give good info into each centers, You REALLY SHOULD be going to an Adults/with CHD or larger CHD (most of the adults with CHD surgeons also are CHD surgeons) center.
IF you haven't found the Adults with CHD Org I think it would be a good place to start out, they have a listing of every Adults with CHD center, that breaks down how many patients they see, surgeries (they list all ACHD centers, do NOT rank them or say which are better, just provide the info the hospital turns into them) ect
http://achaheart.org/resource/ They also have a really good forum, like here that is pretty active and members are really helpful, I know a few use Mayo and really think the care and doctors are wonderful.
Centers and specialists for Adults with CHD is a relatively new field, since it has only been in the past 30 or less years that the babies with the really complex CHD were making it to be adults, So many adults that have had surgeries their whole lives go to CHD centers, since they are the surgeons and staff that have the most experience, (and most ACHD centers are part of a CHD center use the same surgeons ect) which are usually in Childrens hospitals but they treat Adults with CHD also, Justin is close to your age (he is 22) and when he had his last surgery at 19 he goes to the Adult with CHD center at CHOP and University of Pa (they are completely different hospitials but are right next to each other and joined together for the Adult with CHD program) he had a choice which hospital to have it done at and picked CHOP because he likes it better (cheerful, lots of video games ect) every time he is there there are a few adults having their surgery there. a good place to find a listing of all the CHD centers is
http://tchin.org/cardiology/index.htm#CS02
I also was a little surprised you have a mech valve in the pulmonary position, I know of a couple others, but for the most part, the vast majority of surgeons who have alot of experience with doing surgery on the right side, will NOT put a mechanical valve there because because the chances of clots are so much higher even with coumadin, because the pressure going thru the valve is less than the left side (aortic &Mitral)
FWIW Justin's Tricuspid valve also looks bad when his pulmonary stenosis is high, because the blood has such a hard time getting out of the right ventricle to the lungs, the right ventricle gets enlarged and the blood backs up thru the tricuspid valve. As soon as they relieve the stenosis, either with a new pulmonary valve, or conduit and blood can leave the right ventricle, his tricuspid valve is fine.
I'm sorry this got long and rambly. If you have any other questin just ask.