The counter argument would be the interest that you would save. But I doubt that would be more than the rent you are paying. Get your mortgage approval. Use the likes of AIB or KBC that don't have sky high variable rates. Buy the house you want and then pay it off asap. Having a reasonable mortgage on your home is not taking risks with your money. You will then be able get back to saving €100k a year.
Also, companies don't pay high salaries for people to clock in at 9 and clock out at 5. You are probably putting in lots of hours. Will you be able to do that for 20 years? Get the cornerstones in place now so you are in a good position later. That includes getting a home for your family and using captial markets to grow your money (outside of your options. I also don't recommend you keep all your money in company stock when you vest. Unless you have other sources of wealth, it's not a good idea to to reliant on one company for salary and savings. Just look at AIB, Enron, Bear Sterns, Lehman Brothers. Lots of big companies (well, AIB are big in an Irish sense) that ended up with worthless shares.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)