I've got the Cinelli Mash Bullhorns. A bit hipster, but has incredibly comfortable flat sections and with gel inserts & padded tape covering the ridiculous logo managed 2500km on the TransatlanticWay with no numbness at all. Not PBP-legal of course, so not too sure what I will fit next year.
Agree on the tyre pressures as well though - much more important than carbon vs steel. Double wrapping the bars helps a lot - not just for the increased padding but for a larger surface area to distribute the pressure.