Settlers - other than the name was there any conection with what came after?? I'm still playing it on the A4000 for hours at a time and it's still time eatingly good. Don't know of any gfx engine I'd like to see it with though, just more detail, better res, better sound.
The Settlers 2 is a lot similar to the 1st one, but with better gfx, a decent campaign, and more different units.
The Settlers 3, from what I saw, seemed to play more like Ages of Empires..
I still have to see the 4th one.