Thats a nice bike, don't let anyone tell you that its to old and you can't get parts for it. You might ask in the C&V forum, they tend to have lots of opinions about things like this.
My opinion is that a stem with lots of upward angle sort of limits how low you can sink the quill, if you want to lower the bars for any reason. But if its a small frame, then you can only go so far down anyway. So a lot of it(other than asthetics)depends on how well the frame size suits you. If its a frame at the top end of what you can ride, then a regular stem is in order, cause you probably are not going to be raising it that high.(I could be wrong)
I like having the option of lowering the bars for things like extra strong headwinds, while being able to raise it for spending some time cruising around a city.
I actualy use an avenir adjustable quill stem with a face plate
http://www.niagaracycle.com/product_...ucts_id=433715 on my old tourer, a Univega. Its heavy and is not a realy classic look, but it works for me. Most of my other bikes have a regular stem, exept one, a small framed miyata, that has an angled stem. And thats because the headtube is to short to worry about lowering it that much.
heres a picture of a voyageur with a nitto stem. I like the way they look a lot.
http://www.flickr.com/photos/jhvu/2702266296/