Agree 100% with Sarenco. Have a good think about whether you want to move or not.
If you are going to move soon, the potential upside from investing will be relatively small. But what of the downside? If there is a crash, how will a big drop in your €100k impact on you moving? Will you move to a cheaper house or location than you wanted? Or have to put off moving for a number of years while the market recovers?
If it is a number of years before you want to spend it, there are options available to you. It depends on the level of risk exposure (the degree in which your money can increase and decrease in value) you want.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)