WhiteBox Enterprise Linux or any of the other RHEL 'shadows' would work fine and be well-supported by the Dell. I am myself at PARI using WhiteBox in production, and it works well. Yum updates, DAG's repository, etc, work together for me.
Having said that, I'm not running AOLserver on that box, so I don't know that portion of the equation.
What's this about RH donating copyrights?