Edited by SigKapAbs - 1/19/13 at 9:00pm
Sounds like a good OB.
NOT pushy, but covering all the bases and giving you all the info you need to make an informed choice.
(Yes I know, he's going to come from a medical perspective. But then, the attending midwife is going to give you information about the same subjects from a midwife point of view, so it all balances in the end)
If you do talk to you OB about it, come prepared.
His biggest care is going to be what will happen if there's an emergency.
Show him that you have a qualified, competent midwife who is equipped and trained to recognize emergencies (Fetal distress, PPH, etc.) and who will transfer you in a timely fashion to a hospital if it's something she can't handle.
He's still going to give you the talk about the dangers of HB and how hospital birth is safer (legal requirements and such to cover his own behind if something happens) but if he's a good OB, he'll be a lot more receptive to the idea.