It sounds like you've got a thorough plan going on there @ECM1981! All the bases covered!! Jenny at Baby2Mom might be a good person to contact for a super proven donor too.
I already have a 4 y/o son so the thought of triplets is a no-go, twins would be pushing it but I'd just have to make it work, a singleton would be perfect! With Dr M's protocol behind me I may revert back to a single transfer. Otherwise it'll be a double transfer if both thaw well.