Excellent suggestions, guys! Hmmm... Just called our not-quite-local photostore, and they'd sell a Mamiya 120 macro KEH would probably rate as BGN for approximately $200. I could add a M645 from KEH for 300-400... I admit I have absolutely no clue regarding that system. He used to have one, that I know. And it still might leave a little room for small extras.
I have enough time to get something for him when I'm in the US next time, so I'm not in a hurry and could shop around a little. That's why I need you guys' input so badly. :)