I went with the Martian! His power set and versatility are awesome.
Also liked Green Lantern mainly, because of their general constructs and their ability to create so many different things with them from animals to armor to weapons to random stuff like giant trampalines.
Batman was also considered because of his use of tech including mechs now.
I voted Superman because he's my favorite JLA member.
Green Lantern because he's my second favorite JLA member.
And Batman because he's my third favorite JLA member.
I would've voted for Green Arrow too, he's my fourth. But sadly, he didn't make your list. So I voted Aquaman, because he's my fifth.
I like Flash and MMH, but not THAT much.
Wonder Woman, IMO is lame.