The more work you do yourself the cheaper it will be. I would think finding a "good" core transmission from a late 80's to early 90's (up to '93 I think?) A518 would be the ticket then do a rebuild yourself. If its in mostly good shape all you will need is maybe to put new/better clutches in, and a transgo TF2 kit or similar in there. The OD unit is not very tough so if you race, don't do it in OD!
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AT least ... that's what I've been told (and why I'm planning a Gear Vendors for the van..) Good luck!