It's not cheap in terms of the TK, but...
OK, damn, how much is Off Strike again? 4 or 5? I don't have the book with me right now (in the office on Sunday, yuck), and I can't for the life of me remember.
Anyway, 1 pt for Weapon Element: TK, right? And we'll say 5 pts for the Offensive Strike. For 6 pts, you add 4d6. Not bad.
Some GMs might rule that performing Martial Arts maneuvers with TK requires the Fine Manipulation adder, though.
Speaking of the cost of TK, I've always wondered why it's as expensive as it is...it's like STR w/ Ranged (+1/2), which would be 15 pts for 10 levels. BUT, if you compare it the cost of STR, you'd almost have to consider the fact that you don't get any figured characteristics for TK, which would be -1/2, right? Just thinking out loud...