Unless I'm making a scrapper or tanker, I usually avoid melee attacks whenever possible. For the most part, I approached my Dominator like a Blaster.
I got every power in the Mind Control set. Whenever possible, I slotted for ranged damage, specifically with Mesmerize, Levitate, Dominate, and Terrify. The only powers I slotted for a status effect are Mass Hypnosis (which I just left with one slot, considering in groups they don't normally remain untouched for long when teaming), Total Domination (which I slotted with the Ghost Widow hold IO set for the psi damage proc, for concept purposes), and Mass Confusion. I did get Telekinesis, however I also left it with one slot (which I slotted with an end reduc IO) because it is sometimes useful, you just have to know when to use it to not anger people by pushing enemies away from melee types.
As for Psionic Assault, I picked up Psionic Dart, Telekinetic Thrust, Mental Blast, Psychic Scream, Drain Psyche, Subdue, and Psionic Lance. I use them all regularly and have them all 6 slotted for damage with the exception of Telekinetic Thrust. I'm not entirely how many slots I have on the power (I'll post a pic of my build after this post), but it was the only melee power I took. Like I said, I don't care to have melee attacks on ranged toons, but I use Telekinetic Thrust as my "oh **** power". I have it on auto fire (which wasn't a problem for me, since I don't have hasten or a like power to have on auto), but it functions as an emergency power to knock back melee opponents. I've found it infinitely useful in this way. If I'm attacking something far away and another enemy runs up to me and attacks, all I have to do is hit Esc to untarget the ranged fellow and hit tab to target the nearest enemy and he's automatically knocked away. I love it. Another reason I have this as an auto power is simply because I don't have room in my trays to make it easily accessible in such a situation.
As far as Psionic Mastery goes, I got all of the powers except World of Confusion. I don't allow people close enough for it to be effective.
ok forum ate my post asd987123!@#^%#!@