The usual suspects in the late game : (note : not playing GW4, I'm not sure they are all available) : CS300, C919, A320, B737. TU204 are probably no more sold, and are little too big anyways. F120NG is probably too small.
CS300 is an incredibly good machine, but maybe you need the extra capacity of the C919. A320 & B737 are good choices too, but their production lines tend to be clogged. It really depends on the dynamics of your game. Check what is cheap to buy/lease, with a production line rather empty.....but not fully empty either, you want a few other players to keep it open for times you don't buy new birds.