The best attack chain for DB, that's relatively easy to achieve, is Blinding Feint -> Attack Vitals combo. It's a late blooming chain, since you're in your 30's before you get all the powers and slot them. This is my go-to chain for damage and soloing.
I actually prefer the Weaken combo to the Empower combo. Empower doesn't add much of a buff over top of what Blinding Feint already provides, and I find the -def/-tohit of Weaken makes for a decent opening strike debuff.
You might also look at the Sweep combo, which does PbAoE knockdown as a means of leveraging Burn. Then again, I find Burn to be too much trouble while solo, and use it only when it's convenient (ie. on a team with controllers, or against mobs that won't run).
You don't need the combos, but they can provide some nice mitigation effects (knockdown, -tohit/-def) which can add another layer to your team protection.
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@Starflier
Hello there, I've got a level 28 fire/db tanker on freedom and I'm looking for some advice. While I'm loving the offensive nature of the Fire, I'm uncertain about how I should proceed with the DB. I had the Weaken combination for a long while but it didn't seem to stack well and the powers regened slowly. I've respecced to the Empower combination, which works better with my horrible burnination powers. Still, I'm looking to the future and would appriciate any other advice fellow DB users can give. Which other combinations should I pick up? Should I grab any single powers that are just too damn useful to ignore?