I'm just reading your other post after posting earlier. I'm a big fan of vintage Klipsch. I've owned the Heresy's and they are great little speakers, but definitely not as refined sounding as the larger Klipsch such as the LaScala and Khorn. They do utilize the same drivers, but with a much smaller midrange horn body. The Cornwalls, on the other hand, may be a good choice as they use the same size horn body and driver as my LaScalas. They are one of the very few older Klipsch designs that I have not heard so I can't really comment specifically. Like all the older Klipsch stuff, I think they'd likely stand for some improvement via reinforcement of the cabinet, swapping out the zip-cord wiring harness, better crossover components, and a better tweeter. Still, with all those 'faults' my older Heresy's sounded pretty darn good stock and were quite lovely with the various tube amps I paired them with and a great deal at the price you pay for a pair. 15 watts may be at the lower end of where I'd personally take them though I'm sure they'd perform for you, especially in that small a room. Still, as much as I do like the vintage Klipsch + Tube sound, I think if Heresys were one of my options, and I had a grand to play with, I'd look elsewhere for a more refined sound. I did compare the Heresy's to my Soliloquy's and there was really no contest on any level - the 5.3's were superior in every way (this was using both the 25 watt Quicksilver Mini-monos, as well as the 11 Watt Wright Mono 10's). If the contest was with the LaScala's on the other hand, I'd take the Scala's every time. So the Cornwalls could be in the running, but again, I'd go try to listen to a pair, especially given their large size and heavy weight.
Marco