Add it all up (usb hubs, power bricks included too) and put the numbers into the calculator on the genesis block.

http://mining.thegenesisblock.com/

The 330MH/s miners were profitable if you bought them a few months ago but with the rising difficulty of the network, they don't seem likely to break even.

A more likely profitable venture would be to use the same money and buy into bitcoins. Secure your wallet and sit on it in hopes the price rises.