My personal opinion-
First- and most importantly- it's a really cool bike. It's a great geometry, great combination of tubing and a cool color and a lot of the parts are excellent. It's also in really nice shape.
Second- This does not diminish from your bike- it's an almost 35 or so year old bike. This one, while in good shape, is not in "collector good" shape. IMO- that means it should be a great platform for you to play with. A classy bike with the parts you want/need on it.
If you're concerned about resale, keep the Campagnolo parts and put them all in a box together- you can always put them back on later.
If'n it were me... get a crank that'll do smaller rings- a triple if you're into those sort of things, some cool ATB/Touring derailleurs and a wider range freewheel. On the bar shifting if you wish (bar end shifters or the like).
While my Trek 400 Elance is WAY down the notches on the totem pole from your bike, I have it set up similar to that:
1986 Trek 400 Elance by
Dave The Golden Boy, on Flickr
1986 Trek 400 Elance by
Dave The Golden Boy, on Flickr
1986 Trek 400 Elance by
Dave The Golden Boy, on Flickr