Greetings,
I tried just about all of the CMS integrations, but in the end I did not like they way they handled several items (like linking from support emails), I know some people like them, but I found them to be very clunky at best.
So, I went with a much simpler approach using a few WHMCS plugins to adjust the fonts, colors, header, links and added some pages, but it made a giant difference.
http://sigillum-rasa.com
I'm waiting on the new responsive WHMCS theme, then I'll do more. I'm also getting ready to change the branding too.
B.A. Umberger