ive used a deathadder, fk2, za12, and ec2a and i have to say i like the ec2a the most out of all of them. it fits in the hand very well.
i would recomend to you, based on your hands, the g403 or the ec1a. the ec1a has no drivers at all, and is a bit skinnier then the g403, and i think a bit lighter but dont quote me on that.
i love zowie build quality, but the g403 probably have better materials and the buttons are seperated from the shell. it does cost a little bit more though