Fire and Spines are probably the best way to go. Fire doesn't take a whole lotta procs, though. Spines was made for procs; a lot of the Toxic attacks take recharge slow sets. My spines/bio tanker Frankenslots many procs, although almost all of them are Trap of the Hunter recharge slows, which improve toughness rather than doing damage. Old fashioned 'buzzsaw' damage proc based builds are no longer feasible because of changes in the proc mechanics. Better now to focus on debuff procs and add multiple instances of the same kind of debuff to multiple attacks.
Any of the primaries with a damage dealing aura - Fire, Ice, Bio, Electric are the ones I know best - will make a good pair. Shields also works because of the charge; that will need a lot of recharge. You will want a primary with a recovery power if you are running Spines and Quills. If you're doing a -recharge proc based build like I do with Spines, Willpower is also worth a look. Your taunt aura can take Dark Watcher's Despair -recharge procs. This is what I did with a Spines/WP scrapper back on Victory.
I run a Bio/Spines and a Shield/Fire tanker on Torchbearer now. Both are strongly AoE oriented. I also have a WP/Mace tanker that does fairly well in the AoE department, but that's all conventional damage and doesn't take a whole lot of debuff procs.