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Sonic device - This adds a sonic explosion to your next attack. If you take the deafening dissolution, the explosion is AoE. The best way to use this is toggle off your energy builder, hit this, then hit your largest radius AoE. It adds massive dmg AND a stun to your AoE.
Resurgence - A great "oh crap" power. Big instant heal. This is the closest thing to Dull Pain in CO.
Immolation, Electric/Ice Sheathe, etc. - These are the powers similar to Build Up in CoH. They last 12 seconds and the damage buff isn't huge, but they generally have other buffs as well. For example, Immolation lowers the power cost of all abilities. Electric Sheathe raises your energy minimum and causes incoming dmg to give you energy. Best of all, these powers help you bust out of holds if you use them when held.