Ok let me make this simple, so you want waste your $$$$. You have to make a discussion where you want to be based. In US you don’t need type on type, so any jet will do. If you look in to Asia it’s the 737NG, the rest of the world is A320. Remember the transition from 737 to 777 its 3 sessions and a check.
Its seems like you have a line training set up, go for the BUS, its hot right now. Feel free PM
And don’t worry about the haters, you have enough time to make it
Good luck