A few things to consider:
1. Are you thinking of retiring early? If so, a little or alot early. I ask because alot early can reduce the benefit of a pension.
2. If answer to #1 is anything other than alot early, make sure that you are including the value of your future pension in your analysis of current vs other job. A pension can add alot more value that you may expect.
3. I encourage your wife to take a year off but to have a realistic plan for reentering the workforce. Family time is worth its weight in gold and living on one salary can really create some teamwork on cutting costs. Lastly, definitely push towards public education when she returns, a job that includes a pension. One partner with a pension greatly increases your safety net later in life.
4. Determine how you would spend the salary increase before deciding to take the job. $55k is alot of money but with it comes higher taxes. Tax advantages savings can really help you keep most of the extra pay instead of it going to taxes.
5. Do all that you can to understand the culture differences between public and private sector work. They can both be stressful but in different ways. That may be glaring difference or subtle differences but whatever they are, if they make you unhappy, no amount of money would make the move worth it. A few hours spent talking to current employees can be a very worthwhile investment of your time.