I raced in the '70s and fell in love with the 42 combined with 13,14,15,17,19. Still in love with those gears. But 42-19 won't get you up everything. First thing I did after my racing bike was add a 28 inner. Then started adding cogs around that core as FWs and cassettes grew. Rode one season on a racing bike using a double with a smaller inner ring. Hated it. Went triple on that bike. I still have a sweet Campy double ten years later, but absolutely no desire to ride it.

Ben