The more repo's you want, the more conflicts and dependancy issues you will have - it is not a good idea to add every repo you can find.
Personally, base/updated-released/extras, then dag and freshrpms are very reliable I find. atrpms i usually fine, although wouldn't use for a server. Other than that wouldn't touch many others - especially not livna ( http://dag.wieers.com/home-made/apt/FAQ.php#D )
Regards,
Sean
Are you sure about that? The way I heard it, livna and extras were part of the same mold. Now I'll let Dag and Axel speak for themselves, but the impression I got from following the link you gave is that they wouldn't even want you to use extras, just because the extras maintainers won't "play nice" with them.
Back to your main point: if I were still using yum or apt, I'd agree with you--in which case I wouldn't use anything beyond base, updates-released, extras, and livna, and if I wanted anything from any other repo I'd wget it and run rpm -Uvh on it. But with the smart package manager, I can set priorities on the various repos to avoid such conflicts. Smart will even /repair/ any conflicts that it finds when I first install it. (Edit->Fix All Problems...)
Temlakos