My favorite ROM would have to be Android Revolution HD 6.3.2. Sense 3 is great and more functional than the stock ROM.
Currently, I am using "Redemption" by The Collective team. It's based on the ICS AOKP source, and it's been working for me with few problems. One may complain about issues with garbled text, but a reboot is all that's needed to remedy that. Much better battery life than Sense, and it's highly customizable.