Ubuntu. Strictly for the sound effects upon boot.
But seriously, I've used Redhat quite a bit (at work) and Suse. They're fine, but at home I like Ubuntu just for the warm feeling I get knowing that nobody "owns & sells" this version. In other words, it's not only free as in speech, Ubuntu is also free as in beer.
Also, while I don't think there's anything wrong with Redhat package manager, I have found apt-get to be extremely friendly. I guess Ubuntu just maps into the deep structures of my brain a little more naturally than rpm.