[SMGCFP]

As a financial advisor, I'd suggest laying out all your financial goals, and matching your savings/investing behavior to achieve those goals. Things like cars, houses, boats, and the like are "use assets" and are discretionary purchases used to facilitate lifestyle.

Once your savings and investing behavior is projected with some reasonable assumptions to meet your long term financial security goals, use your excess cash flow however you choose.

I hope this sounds reasonable as when I consult with clients, I am careful not to judge the things they spend money on, assuming they are saving/investing enough of their income for their stated long term financial security goals.