Interestingly, I saw someone recently selling off some ADS stuff from NYC area. I think in that, they had a C2000 system. They definitely had a pair of PA1s, which are the factory biamp modules that screw into the back of the L1290/1590 and I think 1230/1530 systems. Quite rare, worth having.
FWIW, I've owned L1290's, M15s, CM7s but currently just the L300s (all a/d/s/), plus 2 pairs of Aerials (the speaker company run by Mike Kelly, who was the brains behind a/d/s/ when the L series were being produced).
The top of the **30 line is the legendary L2030, big, rare, not that pretty, but apparently excellent sounding and quite efficient (uncommon for a/d/s/)
-Ed