76 for sure. The NG is just a variant of what you are already doing, with the same style operation and just a differences course. The 76 is a new type, classed as a heavy/wide body and operates long haul, so brings more than just a type rating but also the experience of the other sort of jet ops. For the ME, who are primarily recruiting for long haul, then it's ideal, and as it's the 787's predecessor in size and routes, will set you up well. It only needs a differences course for the 75, too, resulting in a dual rating, so you could conceivably have 737 300-900 and 757/767 on your licence simultaneously (though only operating the 737 models or 75 and76 at a time). It makes you employable in both long and short haul markets...