the Rhapsody is 7800, TEQs are more money- 12ch for 16k. RS20i is 18.5k, Dirac kit is going to run a few grand as well. When that is considered, they are closer in price.
But again, Jeff isn't looking at TEQs he's considering MCs.
The AP20 was/is a commercial cinema piece that found its way into home theater.
The AP20 has been replaced by the RS20i for home theater use.
I believe there was also a trade in program for people with the AP20 that allowed a comfortable move to the RS20i.
Link for the RS20i: http://www.datasatdigital.com/consumer/products/rs20i.php