That is impossible to calculate without knowing all your personal income amounts ... however if you want to be sure to not owe at the end of the year stick with zero on both. If you were going to do a 1 on line 5 then it should be for the higher waged income and not the lower income.
Try these tools:
http://www.irs.gov/Individuals/IRS-Withholding-Calculator
https://turbotax.intuit.com/tax-tools
http://turbotax.intuit.com/tax-tools/calculators/taxcaster
