I've never played a psi assassin with dodge/evasion, melee and stuff. But I've played a stealthy PSI, or rather, a psi user with stealth, and it's definitely one of the most OP build out there. Add some lockpicking-hacking, and use the max Will to invest in persuasion and maybe intimidation, and then mercantile and crafting using your big brain/INT, and you'll get to experience the most of the content there is to experience in one playthrough.