Cloudburst is an ancient automata, and it's in the discussion for best RAV in the game. Koboldroid Yang has crap casting speed and only learns one -strike ability (and you can't transfer -strike abilities for some godawful reason).
Pulsework Gladiator is among the best SENs.
Proto-Behemoth is a pretty good COM.
Your SYN options are kind of weak. I think I'd investigate Luminous Puma over Thexteron; same family so it probably has similar animations, and it has higher stats plus only one RL ability.
Proto-Behemoth is in Academia 500af. I encountered it only once, fully developed party I had, it came with 2 Caith Sith-like creatures who can take quite the beating, but mister Proto whooped my fully-developed ass BIGTIME. I wasn't really equipped for an enemy like him though.
https://fbcdn-sphotos-c-a.akamaihd.net/ hphotos-ak-ash4/398139_4284731123084_693239237_n.jpg Hi! This is me, just delete the space after .net/