Whoever manages McMurray's Houdan flock appears to have ruined them... there are a lot of deformities which are probably the result of some bad inbreeding. Years ago, in the eighties McMurray is supposed to have had some good birds, large and healthy at least. Even longer ago, in the sixties, some of Barb Piper's starting stock came from McMurray. I tried McMurray in 2007, even then there were some shrimpy birds with poor head points and crossed beak. Looks like things have only gotten worse.
Privett has interesting looking Houdans, the photo I made fun of some years ago really does not reflect the stock which they sell. Get rid of any that have a polish body shape, and or no beard / unusually small beard, and you will be looking at a promising lot of birds. Cackle has some very good birds, but because of their habit of frequently buying new stock at shows, they also have a little of everything and a few pretty crappy ones too. Cackle is recommended if you have a discriminating eye for body shape and already know what a WCB Polish looks like, a Crevecoeur, a Houdan Bantam, and a bearded Polish, so you can get rid of birds that look like they are other breeds thinly disguised with some mottling.
You know, this "3 breeders in the US" is hooey. Have you looked at standardbreedpoultry.com? That site is an index of poultry breeders in the US. There are also at least 2 other longstanding Houdan threads here on BYC. And, there are the old guard of breeders who do not do BYC or get out much but you will meet both of them if you go to the Ohio National.
OP, still curious as to why you "like Houdans"? Have you met them before? Are you a patriotic French person? Or just read about them, or seen pictures?
PS. A lot of serious poultry people have given up on BYC... so no replies does not mean no one is out there. Just that no one is monitoring this rather exhausting, fast moving, hard to keep up with, full of random posts forum. Do try posting in the Houdan threads though. You may attract someone's attention who monitors those threads.