Good decision Donn.
In relation to counterweights, this is what some of us use on our DOBs.
Aussie Magnets
I bought three, and that is more than sufficient for Televue Paracorr and Ethos 13mm.
Buy some stick on floor glides (like carpet stick on squares) to attach to one side of the magnets, to protect the DOB paintwork, and makes it easier to remove them.