I have found the Jet / Aim / Goodrich/L-3 Avionics range to be reliable and well priced Sperry/AlliedSignal/Honeywell are a little more expensive . Thompson/thales/Eads are french . We were talking about attitiude / Directional gyros weren't we LOL ??
Actually the Thales one probably cost about the same as a low end Autogyro