I made 150 Keeper for s10/City raid alien farm.
He's using only his symbiants with the exception of ql200 1HE/AAD right/left arm.
Ql250 Ofab (275 eventually with a bit more effort, sinew+ability ncus+pistols+contracts will make it)
Ql255 CM (can make it up to 264 with the same effort and items mentioned above)
Purelly DD tank, perks dd/aao wise. ~16HP (Gauntlet, behe and Doc HP) and up to 1781ar (self buffed, current items/armor and perks).
http://auno.org/ao/equip.php?saveid=201625