I'm definitely not an expert and sure there are others on the board that are alot more knowledgeable than I am on Doxa's but I used a similar process of elimination.
For me it had to have the orange dial, meaning it had to be from the professional series. Next it must have the rice bead bracelet which ruled out the 5000T leaving the 750T series, 600T series and the 1000T. I thought about a 750T GMT but decided to stick to three hand model plus I already had a GMT diver.
In the end I went with the 1000T due to some comparisons with the 600T not wearing as comfortably, plus the 750T is larger and I am a little over the big watch trend and the 1000T is plenty big enough for me.
The 1000T does have a domed crystal but it is very much Cameron Diaz I am afraid (as is 600T), plus the 750T has a flat crystal from memory.