DP/MM Suggestion
Things to get:
Pistols, Dual Wield, Swap Ammo (for Incendiary), Empty Clips, Bullet Rain, Hail of Bullets, and either Executioner's Shot or Piercing Rounds (whichever you prefer). Concentration, Drain Psyche, Psychic Shockwave.
Things to skip:
TK Thrust. It's pretty bad.
Personal preference:
Everything else. I like World of Confusion even though it's not really all that great. Suppressive Fire is solid but I can live without it. Mind Probe is great damage but is melee and causes redraw. You already said no to Psychic Scream and Scare so those are out too. Definitely get Hasten.
I'm planning on making a dp/mm blaster and need some advice. I plan on making him a hoverblaster type and was wondering what powers can I skip? I'm going to skip scare and psychic scream; anything else I should skip/keep?