IMHO, the finest chain there is for the SOHC4 bikes is the Diamond Powersport 530, aka Diamond "XDL" chain (at Harley shops). It is a non-O-ring chain with the hardest rollers and pins made, with more clearance between them and their shot-peened sideplates than any other made (it's their patent), which wicks out dirt and wicks in oil while riding.
I buy them at Kaman Bearing or Kaman Industrial online, gets me factory-like pricing without the bike shop markup. Around $50. The last one on my 750 went 40,000 miles (really!) before it was stretched 2%, which is my personal wear limit tolerance.