a psionicist build that can work currently for a good mix of PvP/PvE and not too difficult leveling
Brutal truth is that for psionicist a PvE build is going to hopelessly suck in PvP and vice versa.
What's more, a levelling oriented build is going to be very bad for endgame PvE and endgame PvE oriented build is going to be very bad for levelling.
You really have to pick one.
If you can't, least painful way to go about it would be pick a PvP build and level with that.
After 7.0 comes, a levelling and endgame PvE builds are going to be one and the same.