I haven't seen any new, earth shattering TIM released in the last couple of years, so there still isn't a massive difference from good to great compounds.
AS5 is still available, but isn't even near the best any more. Plus, it has a curing time.
IC Diamond works well, and is what I use almost all of the time. No curing time at all. It's very thick though.
Shin-Etsu x23 is good, but horribly expensive at $7-10 for a single gram.
Coollaboratory liquid metal performs...