Hmm, but on this point I would say that whe should co a step further. At least we have industrial-craft so we should be able to come up with something better than a large chest
You want a big chest with "Quantum" quality? Look:
Quantum chest: made from 4 Iridium Plates, Gold, Diamond, Obsidian, Glowstone blocks in corners, Ender Pearl in center. External size: 1 m*m*m, internal size: doublechest for each Quantum chest stored together. When closed, contains all items, anyone placed in any Quantum chest in any world. When opened, disconnect from others Quantum chests and contains random proportional part of all items stored. When destroyed, common storage room decreased and some items can be dropped to the ground. If you try to get some item by tube/pipe/... you can get any random item contained.
So it basically a single, not limited in size, universal randomized container.
For SMP some other rules can be added like: unable to get items, added by other players; tube can get only items, added by tube...
QuoteBut I agree a larger chest would be cool. Not necessarily made from Iridium large chests aren't that strong. But to be honest Iron-Chests with the capacity of doublechest using a single block would be enough. But I'm always a bit hesitant, if they fit into already used blockIDs fine, but waste a BlockID with a chest does not seem reasonable, exspecially since there is an Iron-Chest-Mod that provides you with a lot of chests to use, with also reasonable balance.
Personal safe is exactly what you want.