I've owned several pairs of vintage Klipsch Heritage speakers. They offer great bang for the buck, but to really make them sound great they can all use a bit of work in various ways. Of your two choices, LaScalas benefit greatly from a better tweeter (as is a weak link on many of the Klipsch Heritage). Dampening the metal horns with Dynamat or caulk or similar materials (or fork out for a wood horn replacement from one of two or three folks making them - a bit expensive). Internal cabinet bracing on all Klipsch speakers leaves a whole lot to be desired (only an issue for the bass driver really). I found replacing the wiring and crossover also improved things, though the older AA crossovers are pretty damn good on the Scalas. Cornwalls, as has been already mentioned, will reach lower than LaScalas. The latter drop of steeply at around 50hz. Midrange horns are extremely fast and detailed and require careful matching with amplification. A mismatch can potentially yield some pretty harsh sounding results that are a world away from what is possible with these speakers. Both LaScalas and Cornwalls are high--sensitivity speakers. A 14X13 room is on the verge of being a bit small for either, with the bass being a bigger potential problem with the Cornwalls - I've used and enjoyed LaScalas in an even smaller room, but found they were much more enjoyable in a larger space. The older vintage Heritage speakers were made from cabinet-grade plywood and used metal horns and were made entirely in the USA. The Heritage models that are still being sold by Klipsch are made from MDF, have entirely different crossovers and drivers, and are no longer made in the USA (a replacement driver for one of my speakers was made in Mexico). That's not to say they sound bad, just something to be aware of. The older ones are very easy to work on, and plenty of replacement and aftermarket parts are available for them. Go over to the Klipsch forums for more information than you'll ever need. Altec would be a fine choice as well, per JohnK.
