It is also worth saying that you can do variations on the above 2 itineraries for a "hybrid" number of TPs, in order to balance time and cost (including requirement for hotels):
OTP-LHR-HEL-LHR-JFK-PHX-LAX-JFK-LHR-OTP = 920 TPs
OTP-LHR-JFK-LAX-PHX-JFK-LHR-HEL-LHR-OTP = 920 TPs
This takes advantage of the maximum number of transfers on each fare component.
