This is quite a hard question, the answer depends on a couple of things:
1. How much do you want to spend?
2. How much space do you have for a collection?
If you have a lot of space and don't want to spend to much money Wooster and Long Prosper models are good. If you have a lot of space and alot of $$$ Herpa premiums or Hogan models are good.
If you don't have alot space or a lot of $$$ Herpa would be good. But if you have a good budget Dragon and Gemini Jets are perfect!!
I personally used to collect Wooster and Herpas but have now moved on to Dragon Wings.
Hope this helps you out,
I like British Airways! I'm not sure why, but I do! ;-)