Flexi it is!
Now, not only I use Joomla to build pretty much all my site. But FLEXIcontent has become "THE" CCK extension I install to build the sites.
It is so flexible, it's unreal. And unlike other CCK, the templating system is so simple to play with.
I've tried other CCK extensions which can also be powerful, but either the templating system was complicated or the extensions itself was hard to set up.
The FLEXIcontent team is doing an amazing work!
FLEXIcontent has become the second extension with JCE I install right after I install Joomla!