I'd suggest Dark Blast/Ninjutsu. Fun sets, good visuals, and they work nicely together.
Dark Blast offers -ToHit to stack with NInjutsu's Defense. Has an exotic damage type most mobs don't resist well. Has solid AOE attacks as well as ST attack chain.
Ninjutsu gets its defense toggles early, compared to Super Reflexes. Has somewhat lower Defense Debuff Resistance (DDR), but you are not a tanker and can avoid more aggro at range vs. the melee ATs, and can likely fly out of reach, so not as important. Ninjutsu also has a heal (so you can skip Siphon Life if you wish), and an Endurance heal, too. It also has a power to slot +global defense uniques if you wish to spend for them later.
It does not cost a lot to make a workable build with this, and with IOs and influence later on, it only gets better. I have one, it's a great combo if you like Dark Blast, which it seems you do.