When David Wagner began to import several AC Mk III's (thats the 427 variant in Limey terms) in the mid '90's the original plans were to use the CSX prefix. About half way through production this was abruptly changed to COX, because whether or not the prefix was "active" they were forced, apparently by SAI, to reconsider using it, and reconsider they did. Sounds like the price came down a bit....they were going for about $100K a few years ago.
If these newest gliders are anything like the earlier ones, they are a beautiful thing to behold.
Bud