Berserk > OoC in my book. I spec'd for Furor/Naturalist/OoC off the bat and soon regretted it because I was missing out on a "fun" new talent. I had no idea HOW fun, though...Berserk is icing on the Mangle cake. And it's real sweet sugary icing too, not that fake crap that isn't sweet. With a 3-minute cooldown it lets you basically spam your special attacks for 15 seconds every couple fights -- absolutely wicked. And in PvP a talent-based fear break on top of my trinket is muy muy cool. OoC is at the top of the list for "when I hit 71" but for now Berserk delivers many more smiles than OoC ever has.
I like Primal Tenacity, too. For PvP anyway. Cutting 30% off the length of every fear and cutting the damage those stunlocking rogues throw around by 30% are both goodness in my book.
Furor is mandatory for any Feral build, I'd say. 10% damage boost is a must, too, but I passed on it for now (today anyway) just to grab some of the new talents in Feral to see how I like 'em. That's all just me, though, I say spend the gold to try different specs and find what YOU like.