It's extremely important to know who built the boat. If it's a Marstrom the upgrade path is clear (See Rolf's post). It will not be inexpensive (but worth it)

If it's a Reg boat... I would talk with the Aussie's and the Brits' how the boats are handeling the loads a few years out. They were never quite as stiff as the Marstroms and the spinaker only exacerbates this issue.

I don't know of any T's in North America that have been updated that are not Marstrom boats. (translation the Tornado circuit has all Marstrom boats)

The carbon mast is not cheap but it's bullet proof. It's also very stiff and so you burn up blocks (and crew) quickly closing the leach up wind. On the otherhand... if you dump the main with spin up... you won't loose the rig.
Teams are now working the mainsheet down wind because the mast is so good.

Mark