After hold'em, I really like to play pot-limit Omaha. On the second place put the pot-limit Omaha hi / lo. A very interesting and dynamic game. In third place seven-card stud. This is a classic, not timeless form of poker.
I have won the razz freeroll on old carbon before and also the omaha hi/lo one they used to have too. I liked razz alot so its was second after holdem, then Omaha H/L and then my third favourite was this game i made up with an old friend called crazy 8 poker which i cant remember all the rules to but it was pretty cool.