Lava/Water Fabricator-
At the cost of 1,000 EU it creates a bucket worth of water you can put into a cell or bucket. (Nice for when you're in the Nether, and want to have water cells*.)
At the cost of 20,000 EU it creates a bucket worth of lava you can then put into a cell or bucket. (Nice, as it can keep you from dying in Lava.)
EU storage in the form of Water/Lava Cells, and prevents infinite free energy from creating it. Hook it up to a Redstoned MFSU/etc and have it store extra energy in Lava cells. Instead of spending more diamonds for instant storage, it allows you to use the lava/water to get that energy back over time.
Holds 64 Cells, and ejects them into the world, or a nearby chest like the pump. Accepts Medium Voltage.
As for the recipe:
= Pump
*= To create more obsidian if you get lost in the Nether and need to make a portal. (Just one idea for that.)