Obsidian Aggregator

In terms of material gains per minute, the obsidian aggregator produces far more resources than a "normal" aggregator, with the added upshot that each bucket of lava provided yields eight obsidian instead of two. There are many ways to get your Obsidian Aggregators to produce lava:
Like a furnace, the slot above the "fuel" slot is for lava buckets. The slot below that water-droplet shaped grey-area is for water buckets.
The two slots to the left are actually for placing coal and redstone. Because alchemical recipes exist to produce lava from a single piece of coal and redstone dust, the Obsidian Aggregator has the power to transmute lava buckets built in. It draws upon these fuel slots to do so, but they are optional for lava buckets. Simply place one stack of coal and one stack of redstone in either slots (it doesn't matter which) and it will consistently refill the buckets with lava as it produces.
The slot below, naturally, needs water to produce obsidian, and must be refilled manually unless you can come up with a clever way of refilling it constantly.
The standard rate of obsidian production is 12 minutes (1.5 minutes per obsidian block).
Using a volcanite amulet in the "lava bucket" slot will allow your O. Aggregator to produce obsidian at a slightly faster (10%) rate, and also at a lower material cost. Instead of giving it a piece of coal and redstone dust, simply give it two stacks of redstone dust (the price of using your volcanite is 2x redstone per cast). The evertide, similarly, will produce and endless supply of water when used in place of a water bucket.
The rate of conversion using a volcanite amulet is about 10 minutes and 48 seconds, about 1.35 minutes per obsidian block.
You can also sacrifice some of your obsidian by turning it into ICE and use that in place of water buckets.