I would include Snell, Mirage, and ADS from that time frame also.
I can only comment on the kg4. I have a pair and I think they are wonderful. They are in a second system used for passive/background listening. For this kind of set up just through them in corners and enjoy. They sound great at a whisper and when they are cranked up.
I've got their big brother, the Forte's, also. Now if you want the audio tricks we all love like soundstage and imaging I believe careful set up and corners are very important. They are both outstanding speakers for what they go for on the pre owned market. Good luck in your search.
I second the opinion that you should include ADS in your list. The ADS L-710s, 810s, and 910s were fantastically good speakers and will hold their own even today.
And, it's your lucky day - there are a pair of 710s and 810s on A'gon right now. The 810s are ridiculously low-priced and the 710s look to be in superb condition, albeit more expensive than the 810s. Me, I'd buy the 710s - they are some of the nicest speakers I've ever heard.
If you have the money, I'd suggest buying them both and then keep the ones you like best...