To me when you say conventional set first thing pops into my head is postwar and thinking a little deeper yes there are some nice modern sets also but again the best conventional sets to me as kinda personal as I own them is the 2571 Which is a replacement of the one I was given as a child and then I have the 2267W which has the 736 w/2046w tender this set I have all the boxes including the set box. and both of these run flawlessly as was just running them the other day.
With that said there's a lot of great conventional sets out there.