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I really liked the C20 and regret selling it. The C22 and C11 are essentially the same with some cosmetic differences. I've had both, and like both very much as well. I found the C20 to be thicker sounding, more of what one might expect from an old tube preamp. The C11/22 is a little more accurate, not as tubey sounding as the C20, or MX110(which I also own) for that matter.
Bottom line, assuming they're not just "mint" but properly electrically restored you really can't go wrong with any of them. Certainly not from a investment standpoint.