I was in the same situation as the OP with my proto Rom in that the trusty 105 began to notch after X years. I've used CK and VO headsets on other builds, but I gave the IRD needle bearing one from Riv a try. It installed very nicely and once I cleaned the protective grease off and relubed the bearings, the handling improved markedly. I've never experienced shimmy on any of my bikes, front loaded 650'ers and featherweight racers, so I can't comment on the impact of the needle bearings, but the IRD works a treat. PS: you might need an extra spacer switching from 105 to the IRD given the slight difference in stack height.
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