Well first off, my strongest bit of advice: no offense to your wife but BUY THAT DUCATI!!!

I have an M750 and a 696 and my bf has an 848. Worth absolutely every penny and then some. Although you may be ruined for other bikes, lol.
As for the mid-life crisis...lol! This is no crisis, it's simply enjoying the fruits of one's labors. As you pointed out, most of us aren't in the right financial situation to indulge ourselves when we are younger. Why not do it now when we have the means and the maturity to handle it? I know I sure appreciate what I have so very, very much now.
We aren't in mid-life crisis - we are in mid-life blessing!