Amperage Calculator?

[Rivermaxx]

I know I have seen one I just cant remember where. Can somebody lead me to a link. I am trying to figure out how many amps I need for a battery for this high speed event I plan on attending. It a one shot high speed run so I dont think I need that much capacity unless I need more availiable amps. I was thinking of running at least 2 3s 5000mah 30c in series for 6s that would be 150 amps continues and 200 amp burst. Should I run 2 6s 5000mah 30c in parallel for 300 amps continues or 400 amp burst. Or is that overkill? I know it is heavy @ over 2 pounds just for batteries. I was also looking at 2 6s 3300 30c in parrallel for 198 amps continues and 264 amps burst also. Which would you guys run.