For a standard adult subscription site, it sounds like you already got your best options presented to you.
However, if anyone is looking for a CMS beyond managing a members section, here's some more info for you:
http://www.cmsmatrix.org/ - lists a bunch of CMS solutions. Perhaps you guys that offer CMS' can see about getting listed there.
http://www.postnuke.com - some of my associates use this.
http://www.cpgnuke.com/ - same as above.
http://phpnuke.org/ - another popular one amongst my adult webmaster acquaintences.
http://zope.org/ - this is one of the original CMS solutions. Very powerful, secure and portable. It is built on the object oriented programming language, Python. I'm using it on one of my sites.
http://www.buildacommunity.com/ - I will be using this suite on another site that is in the works.