There's a placeholder post which could hold a few more reviews, I might add some KC or ELP to that just to make up for our slightly embarassing mistake. I've already reviewed Tarkus and I too prefer it to Brain Salad Surgery. Not too many like ELP around here I think so if people can sort of agree they should be mentioned, at least I don't think many would dispute that Tarkus would be a good recommendation from them.
It'll be a bit harder to reach a consensus on what KC album should be up there. I personally like the debut and Red the most, but I'll admit I'm not an authority on KC compared to some of the other members here.