Real measured watts excluding the minipc now is 217W and it's doing 52GH/s sha-bitcoin and 880KH/s scrypt-litecoin.

Potential with current USB hardwares would be:

(wow to think about this little box be 8MH/s SILENT Scrypt miner)

113x Dualminers 70KHs =   7.9MH/s Scrypt litecoin.
113x Antminers at 2GH/s =  226GH/s Bitcoin.

I like the box for now and future USB miners... maybe to buy Antminers while price drops or populate it with next gen Scrypt miners.
Power usage is covered and would only max those psus around 400watts.

Also the external USB-hub gives this box potential to run anything from Avalon Clone to Hashfast Babyjet (sorry i know HF is swear word)