Yeah, I use 767-200ERs for all of my long-range flights, since they fit under the 200M value limit and are just under the 300 pax limit for profitability.
Absolutely correct here.
I have tried and tested all the long haul A/C available in AM, even the A380.
If you are determined to add long haul then 'TheKevinShow' advice is spot on and my own experience.
You can fiddle with the engine suppliers and extend range where needed to just 1 or 2 specific A/C if you want to boost range beyond that of a standard 777.
It comes in under the all important (but which many players forget) 200M price tag and carries less than 300 punters.
As a bit of an anorak, I keep details of previous game play and especially long haul profitable A/C on certain routes.
Without exception, once taking into account maintenance, lead in delivery times ( 150M is a lot to spend then wait 72HRs for delivery, when a you could buy many far more profitable S/H A/C and have them in your hanger in half the time making money) the B767 has been my best find for launching and reaching new L/H destinations.
I have a few other tricks up my sleeve, but I'm keeping those to myself.
Happy flying.