I'm really tempted to pull the trigger on the current PE sale ZRH/BSL-LON-NYC // NYC-LON-ZRH/BSL for CHF 700 / GBP 510. Would upgrade the inbound to CW using Avios.

Can you give me advice on what to look out for hard-product wise? My research so far suggests the best PE is on the non-747 machines. Is that still accurate?

And what would be the best option for the inbound? (I admit this last question is somewhat off-topic. Assuming I will get the Avios upgrade, I should ask in the respective CW thread.)