2: I'd take Thermal Sunder, myself. Better damage type and Disarm is borderline worthless. They have the same damage calculation.
3: Psituned Vitality is generally considered better, especially if you want to use powers. I could see a build that focuses on Evasion, though, especially with the +10 from Levitation.
4: Psychogenic Vim. In theory, Vitality Siphon is infinite sustain, but it's distinctly inferior as a means of restoring Energy. Somewhat more practical if you have a means of restoring Energy between fights (like Hand Milk) or are willing to carry and use Power Potions.
5: Gravity Flux can set up Geothermal Spike and Trip is guaranteed to negate turn from the target, if you don't KO them first.
This is a row I haven't thoroughly tested, so Entropy Waves might have some use cases I haven't realized.
6: I think Third Eye Aim. Especially if you're planning on using something that boosts Intelligence above normal Maximum. You get the full value of your weapons as Stat Sticks.
Telekinetic Warrior requires you to be unarmed to get any benefit, cannot hit Flying enemies from the Melee slot and requires you to increase Physique and/or Aim for maximum benefit. That said, if you want to use a weapon with Stun/Trip/Freeze Chance, you'll have to increase Physique/Aim anyway.
7: Debris Field. Vortex Brand is only potentially useful vs very evasive targets, and if you're not using powers.
8: Concussive Augmentation if you want to use basic/weapon attacks.
Geothermal Spike if you took Gravity Flux. Or you could use the Hookstaff to set up Geothermal Spike.
9: Entropic Whip has a better chance of Freezing than Entropy Leech. It can also Crit for Deep Impact.
Acid Cloud gives you a different damage type. (Immobilized = Stun & Paralyze). Up to you.
10: Last time it was tested, Deep Impact had an interesting interaction with Force Darts. Each Dart Crit would increase the Stun duration, so you could potentially Stunlock for a long time. Auto-Crits from Geothermal Spike and Acid Cloud don't proc the Stun.
Mind Crush can detonate Deep Freeze.
11: Haste, if you want to be making weapon/basic attacks. Reality Schism may or may not be worth it if you're using powers, though.
12: Probably Gravity Crush. Enemies meant to be tougher are usually bigger. Can detonate Deep Freeze, unlike Psychic Slam.