Klipsch LaScallas vs Klipsch Cornwalls?

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.

Being a fan of the Heritage speakers as well, I would be concerned about your room size. You may want to consider the Fortes or even the Quartets. The Fortes go lower than either of the two speakers that you are considering and take up less floor space. They are also optimized for in-room placement. The tradeoff is that they are significantly less sensitive than the speakers that you are considering, however your Dyna could drive them to club filling levels so I don't think that is an issue, unless you want to go single ended.

Don't take this the wrong way but I wouldn't put either Klipsch in a room that small. My Cornwalls were barely small enough for a 15 x 22 room. You will have loads of detail and volume but no imaging at all. Stand mounted Heresey's should image better with a little less bass(I've had these too). KG4's may work too.

I'd suggest finding some Coincident speakers if you can't find Spendors. In a room your size, it will be like having giant headphones using a pair of Cornwalls. I love/miss my Corwalls but would never use them in a room that small.

I Agree the Heresys make more sense for that room. I own LaScalas and Heresys both the first type.
The secret to getting a satisying sound from any of them I found was to give the woofer power to spare so it will breathe and balance the overall tone. McIntosh power amps synergise well inspite of the general conviction that these highly sensitive are ideal with SETs.
I also agree to dampen the squawker horn and would take some nasty sizzle out of the tweeters via upgraded crossovers if they were not just part of a collection of speakers that aren't in my primary or second systems.

A 15 x 22 room would be fine for Lascalas or Cornwalls(from lots of experience). If an image cannot be created some placement trial and error (both speakers and listening seat), room treatment, and associated equipment would help. As far as a 14 x 13 room, this could be a bit small for either of them, but could work with the right know how. Just the speakers and 1 listening chair could be magical, as well as everything else I mentioned.