hey bro.... you should just go for the first one that you like .... as that the one you usually think about the most ....
Also it just depends on how you like your figures...
if you play with them then i do not suggest you get an Hot toys...
But from my experience with HT ironman and i got a few and custom them as well , it very well detailed but the articulation is pretty bad and is very fragile. I recommend the diecast ones better .