janluka

Hi everybody,
I searched in the last posts but I didn't find definitive answers to this:
What are the most used CMS for building a typical membership site ? What do you use ? I've heard about Awiz. Does anybady use it?
What would you give as advice for a starting point?
I'm a webmaster, I've got programming skills in PHP/MySQL but I'd rather use a tested and ready-to-use product and I'm quite new to adult sites.
Thanks a lot for your advices
Janluka