Dubsado's ACH with Stripe now has over 1500 US banks added to the list. Before we only had about 10 or so, this is really opens up the options for you and you US clients.
Stripe ACH currently does not have support for international ACH banks, but they did say they are working on it. When they do, we will have it too! ;)
When paying an invoice, clients and search for their bank here: