I'm trying to create a shield to measure current on the various legs of a standard PC ATX power supply. I've found a handy part from Sparkfun (http://www.sparkfun.com/products/9498
) to bring the power onto the shield, but it's rather large and wouldn't leave much room for anything else on a standard sized Mega Shield. I was wondering if there's any reason to avoid creating an oversized shield, I haven't yet purchased an Arduino Mega, so I'm not sure about any potential clearance issues (specifically the USB cable). Additionally, it seems most PCB fabs offer better pricing on plain rectangular boards, versus something like an Arduino.