I would add to insure that the frame is faced prior to using the anti-seize and installation.
One of the factors with seizing is the point pressure exerted in a specific or focused area. This is often the bugger with threaded parts and seatposts (as the side opposite the load, your butt, is pressured more intensely than the rear of the post).
If the frame is faced properly, then there will be even surface pressure the entire circumfrence of the cup, eliminating yet another probably seizing factor.
With proper preparation, the Ti headset will give a long term of service in the Ti frame.
cheers,
rody