It looks like you've gotten some good responses already.  The only thing I'd like to add is to suggest a π cornerhorn as a possibility.  It is a simple cabinet to build and I think it sounds great.  So if you have two good corners, this might be an attractive option for you. seven π cornerhorn
seven π cornerhorn
Get the best woofer you can afford and implement it in a π cornerhorn.  Since the Klipsch midrange and tweeter were baffle mounted, I expect the crossover is already worked out to sum properly and I also assume the midrange crossover frequency is pretty low.  So just crossover the woofer in the π cornerhorn at that point and add a conjugate Zobel and it would work very well.