I mostly wish for remakes because of bad controls, not because of graphics or anything.
So the #1 game I would like to see remade is probably Gothic 1, but I would be totally happy if it was just a port to the Gothic 2 engine with updated controls. In fact that would be the only way to do it right. And then a completely new Gothic 3 in the same engine. XD
Other titles would be Fallout 1+2 and Arcanum, again mainly because of their tedious controls.