Just curious: what is reason that you are interested in Chanteclers? I heard that they are flighty and not good layers.I would never pick Marans or the German New Hampshires (the one you got from me) for my laying flock. I consider them "show birds", like silkies, ornamental but hardly worth having for the eggs. I disbanded my New Hampshire flock for that reason (you got one if the last offspring from them) and would certainly do that with the BCM's, but for the constant barrage of customers wanting them. I never recommend them as layers, I can't sex them as chicks, yet still people travel long distances to get them. Must be the French mystic or something. They are pretty, well mannered, and seem very hardy, but not my first choice for productive layers.
Welsummers are way better, IMO, and even my Welsummers are not what I'd like in terms of laying and hatchability, which is why I'm trying to scale up on the Welbars or locate another dark egg strain of Welsummers to infuse new genes into my line.
In general, I find the dark egg layers a bit more frustrating than the blue egg layers. The Legbars and Black Sexlinks are wonderful. I also really like purebred Ams, though they take a long time to sex out. They are otherwise close to perfect, IMO.
I have a box of 50 chicks coming today from John Blehm. They are Ameraucanas and Chanteclers, I don't know how many of each breed or color, that's going to be a surprise, but I'm excited to find out what is in that box. One of my goals this year is to upgrade some of my existing stock, and getting better Ameraucanas is on the top of my list.