Either the Protech or the Ti Millie.
If the Ti Millie, consider a step up and get the Fluted version. The difference is amazing, on a new level.
I speak from history of making light-weight versions of Ti RIL frame-lock + G10 MIcarta Millies for my daily carry.
A Fluted Ti Milled is weight-wise right in between, and the radiused scales and grip-texture are superlative.
There is actually a fair amount of handle material removed in the profiling & fluting.
The Protech is also very nice, just a significantly different knife in my mind (should get both ;-)
Photo below: On middle knife, I also radiused the spine of the blade (really nice touch on a Millie I think).
This photo might help to show the radiused scales of the Fluted (in comparison to standard Ti Millie profile):