http://www.taxcalc.eu/
According to the above website you'll be down significantly but that doesn't include the absence of childcare costs and the money you'll probably save by having a slower pace of life.
Yearly take home pay. (Married)
Selected Tax year is 2009 #2: 'Emergency' Apr-09
Gross Take Home Pay = € 90000.00
Tax = € 23975.28
Take Home Pay after Tax = € 66024.72
Less PRSI = € 6529.87
Less Spouse PRSI = € 0.00
Net take home pay = € 59494.85
Yearly take home pay. (Married)
Selected Tax year is 2009 #2: 'Emergency' Apr-09
Gross Take Home Pay = € 145000.00
Tax = € 40041.28
Take Home Pay after Tax = € 104958.72
Less PRSI = € 6529.87
Less Spouse PRSI = € 4135.84
Net take home pay = € 94293.02