If you are serious about benchrest, I would look at the vudoo V22s or another benchrest action. I have a T1x and like it, but youll want a heavier barrel. I would recommend also using a more generic action footprint so that more accessories will fit.
After putting the money into it, youll be close to Vudoo money with either. Which is why I would probably save a few extra months and get the right rifle for the job rather than take a regular rifle and make it work.