Quest makes the most sense for a revamp. It can be contained in a single box, requires no expansion, and works as a standalone game.
You stick 8 Heroes in rather than the original 4 (ie. you make it so you don't need expansions), you stick in a good cross-section of Warhammer races, all the magic items from the previous games (maybe not as cards, but as a table you roll on), and you're done.
I'd probably buy it for the new tiles.