would deffo go with a 600se or mamyia equivalent if money is no problem...
I've seen great results with the 180 and 195 as Brian says.

but if you want a more interesting idea, maybe get one of the old all plastic type 100 cameras, chop the front off and stick the lens and shutter off an old mf folder (or modern LF lens if you have one spare).

last time I checked I think the lenses on the old plastic cameras were about 110mm, but you can extend or shorten that if you need to...
this would be dirt cheap too.