@HighVoltage and @Alex Nikitin,
Quick opinion, does the 34470a perform significantly better (subjective) than the 34465a in terms of drift, enough so to justify almost twice the cost? No need for a multi paragraph answer, just a quick opinion. I may have an opportunity to upgrade my 34465 to a 34470. I have not seen any conclusive evidence to show the 34470 performs significantly better. I think Frank did a comparison once, using one of HV's meters IIRC, not sure where I read that now.