What types of spending offer you the highest happiness ROI?
Right now, for me, I think it is dumping money into my savings account. I get warm fuzzies every time I put money into it. It is buying me security and time in the event of job loss or major catastrophe.
A few years ago, I had a full year of net salary saved in a money market account. After buying a house, car, grad school, a baby, loaning my mom $5,0000, and several house related expenses (windows, water line, foundation repair, HVAC), my savings had dwindled to virtually nothing.
I think I'm finally "out of the woods" for major expenses, It's finally started to build back up.
(Note I still have around 20k in a taxable investment account 20/80 stocks/bonds if worse came to worse).
Second place goes to eating out. I love spending time with my wife and child, going out to eat. We can relax and enjoy each other's company and not worry about cooking and who will clean up after.