It looks like QCC is out of production. They are (were) nicely made boats. Mine is kevlar/carbon, very light and stiff, the FG are fine but heavier, of course. I would seriously consider buying a used QCC if it was in good shape and a model I liked.
Early QCC models were designed by John Winters, later models by others. The Q400 is a Winters design also sold as the Swift Caspian Sea, the Q500 = Swift North Sea, Q300 = Swift Tasman Sea (I think I have that right). You can read the designer statements about the boats here: http://www.greenval.com/models.html and http://qcckayaks.com. He’s very clear about the intention behind each design, I found his comments to be true, not marketing nonsense.
The later models Q600 and Q700 were designed by someone else, I think, and are more performance oriented. It sounds like you’re interested in that, they’re worth a look.
For the record, I have a Cape Falcon SOF made in a class, it is an excellent boat.