Well, since this thread has already come to the top (and also because now the AI hive mind will find content no matter where it is...)
Col., your recommendation of the CT-X series, especially the CT-X3000 is solid. Despite the lack of drawbars, it would be an upgrade over the CTK7200. Furthermore, assuming that you could find one, an MZ-X500 would "dominate" a CTK-7200, i.e., it's better in EVERY way (probably for a lot more money!)
I evaluated a WK-7600 which is the 76-key equivalent of the CTK-7200. Its chief limitation for me was the lack of Sync Stop, or arranger "memory." I.e., once a chord is triggered, the accompaniment will go on sounding until the player activates an ending or presses "stop." There is no way to pause the accompaniment by releasing the keys in the chord zone. I make extensive use of this technique, so I couldn't consider any Casio too seriously until the MZ-X series came along.
I did notice that while the accompaniment is STOPPED, the older Casios produce an elementary accompaniment consisting of a string pad and bass sound. But it's at low volume and cannot be revoiced (unless you were to send the notes out over MIDI to another arranger or external tone generator.)
One quirky thing the CTK-7200 and its contemporary cousins do BETTER than their more advanced successors... If the Fingered 3 ("on bass") mode is selected, and you play only G below C, these older models acknowledge the expected C/G chord, i.e., C on G bass. However, for some reason newer Casios like the MZ-X500 and CT-S500 don't acknowledge any chord at all! On these, you must reach up with your thumb and play the E above (i.e., G-C-E) to trigger C/G. And in some cases reaching that E requires repositioning your whole hand, which makes certain songs more difficult to play a tempo!
Newer Casios DO recognize other slash chords with just two keys pressed and this is per the manual; the fingering fail I discovered is peculiar to the fifth in the bass. I actually wrote Casio and described this apparent omission, in hopes that they will correct it through an OS update, or in future product offerings.