I did this build a while ago and I believe he was 3 swashbuckler, 7 psion (for 10th level build). He utilized psychic scimitar for his weapon, that way you are making touch attacks.
I think he was a kalashtar as well so he utilized power-link shards to boost his inertial armor to like +15 or something, so he ended up with an AC of 40 or something, all his attacks were touch and they did like 1d6 + 15 damage or something.
He was also a telepath, with schism which expanded knowledge for astral construct and control body.
edit: I forgot he was a 12th level build so that's how he took the expanded knowledge for a 4th level power.
So every round he attacked, manifested a power, manifested another power with schism, and his astral construct attacked (and he could manifest 9th level ones because of his power-link shards).
He was a one man army.
btw, it is worth going swashbuckler, not only for the double int bonus, but because it gives you a BAB of +6, just enough to give you 2 attacks a round.