I actually just regripped a set of Tommy 845 Titanium's with midsize Champkey X's. Great grips, can't go wrong for the price... do it.
Also, those irons are sneaky good... compact, yet very forgiving, the sole shape is way ahead of its time (almost Srixon-like v-sole complete with some leading edge relief), and the grooves will never, ever wear out. The face is made of, well, Titanium.