Hey boys, this is for Ishbaad and Kheycear. Chime in as and when you like, I won't be keeping this daily (necessarily) and you shouldn't bother either.
Ishbaad, if you would like to keep your cavalier levels, then we can talk about getting you a true dragon mount. Otherwise, a dragonkin will be your mount. We will have to modify the cavalier class a bit, but suffice it to say that your mount will be more powerful than a regular cavalier mount - and to balance things with the other PCs, also more powerful than a dragonkin mount.
Oh, and yes, this is why I figured keeping levels in cavalier would be awesome.