Is there a website or any location that would help me determine which power unit to buy? In my case, the amperage, not the voltage is the biggest issue. I run a Trace Elliot Transit B (9v, 1A), a EHX Cathedral (9v, 200mA), a Markbass Supersynth (12v,500mA), and 3 or 4 regular 9v, >100mA.