You'll want to save any teeth you can. I'm fuzzy on it, but I think pulling all the teeth speeds the deterioration of the jaw bone as well. And you wouldn't beleive the number of elderly relatives I have who make a point *every* time we are eating together to make sure to take care of ds's and our teeth so that we don't end up with a full denture set. Dh lost his front teeth when he was hit by a car at 12yo, and is on his second permanent bridge. From the time the first one failed to it finally getting replaced was a long time, and he was very very unhappy with the partial that had to be removed every night.
From what I've heard, implants are better for the jaw health than dentures, but they are more pricey and not everyone is a good candidate for them.
eta: I think they can put crowns on partial teeth, it's just a bit pricey. I had a crappy dentist prepare a tooth for a crown once, then 2 days after he put it on he sheared it off while pulling a wisdom tooth. So it's only half a tooth now, and food gets stuck there all the time. Each dentist I've seen since then says they can build it back up or put a new crown on it. They also have all kinds of inlays and porcelein fillings that can help with the cosmetic aspect. And veneers are also an option.