Follow your gut on this one!
The OB may never be on board but as you said you will only give birth a few times. It's up to you as the one giving birth. I have had a hospital birth and a homebirth (both with midwives) and I am really glad I decided to have a HB for #2. If your DH is not on board educate him till he is! Good luck! :
p.s. Have you looked into getting an in network exception on your insurance? It took some legwork but I got my insurance to cover it 100%.