You might get more responses on the acoustic piano forum here: http://forum.pianoworld.com/ubbthreads.php/forums/1/1/piano-forum.html
Otherwise, I'm no expert, but I think the Chickering brand pianos that were made by Baldwin during that era were not bad pianos, and were actually made at the USA Baldwin factory. At least the one I played was. You could tell by the proprietary adjustable rear hitch pins on the rear of the cast iron plate.
The 9K Cad may be little high, but if it is being sold by a dealer, it might not be too high, I'm not sure. If you were skeptical about the key not returning fast enough, that is reason to keep looking, but that can be fixed. If you liked other aspects of the Chickering, it might be worth asking the dealer about it. Not sure how well that particular dealer preps it's used (or new) pianos. But I like a fast repetition key myself, no sluggishness or sticking. But again, that is something that can be fixed/improved upon.
As for a nice used Yamaha, yes, that would be a better piano than the Chickering made by Baldwin, by far, in my book, but is just my opinion. Also, an authentic USA made Baldwin would be a better piano than the Chickering as well.
I don't know much about the Irmler, but have heard of the brand.