WP is the route we chose. We used Gonzo for 3 of our sites including our main paysite and VOD portal and have been very happy with it. Have a look to see what we did:
www.canadianpartygirls.com - this is our flagship paysite and there are many custom changes to the theme.
www.thehottestgirlincanada.com - this is an unmodified version set up as they intend the theme to be.
www.americanpartygirls.com - this just shows how simple it can be made, in our case for a coming soon site.