i'm planning on running my USB miners plugged straight into my litecoin mining rig (2 front mounted USB ports (2 miners ordered) - although i'm concerned about power - should i get a powered USB hub? i have also got a raspberry Pi that i have thought about using too - any recommendations?)
I think your PC will have enough power to supply juice to the USB ports for the miners.
With your Raspi you'll need a powered hub for sure. IIRC the Raspi only supplies 100mA to the USB ports (in total?).