Well, I'm still kinda torn between the all infantry GK list (which is also much better painted, since I did my Tau like damn, maybe 8 years ago?) and the Tau Hammerhead based list.
I think the GK would be probably all deepstrike, forgo transports all together, use the fact that 24" can cover a small board to my advatage. Kinda a fragile list, in a way, since GK are so expensive, but huge Dakka, and should be able to deal pretty well with all things that come it's way. Also, I kinda want to try the daemonblade, and this seems like the place, but of course the Inquisitor can't DS.
On the other hand, we have a dual Hammerhand list with some supporting troops ans a Shas'El. Seems kinda unbeatable, actually, with a notable vulnerablility to deep struck meltas. (no, I still don't fear that chimera list) I also wonder if it can get flooded by somethign like Orks, but I don't think so.
I haven't played my Tau in like 2 years, though, at least.