I have replaced the bearings in my last TT and now with my Rockwood 5ver with Timken brand bearings and races. In my last TT I was doing the regular maintenance and 'flushing' the grease out and found flecks of metal in one hub. The made in China races started to flake away, even with plenty of grease. With the 5ver, it used the same bearings so I figured for less than $150 for bearings and races i'ts cheap insurance.
With the Timkens, I'm using Timken Premium All Purpose Industrial LC-2 grease which has a dropping point of 500F ...and if you want to talk about paranoid... I carry a full set of tools (seal pullers, brass punch, seal drifting tool) and the parts to rebuild a hub... this year I bought a complete drum just to have one on hand... I run with the decorative hub caps off... and at every stop, I check the hubs with infra red thermometer. Mind you if I lose the spindle I'm screwed