Well, cost-wise, 4X5 is the new 8x10. Downsizing isn't such a liability as it once was, due to the higher detail capacity of newer films, and the superior quality of relatively modern lenses. But that set of facts comes more into play when trying to substitute 120 shots for 4X5 ones - another cost-saving option. I've got quite a backlog of house remodeling at the moment, so have to be careful about any optional spending.
Thanks to certain lucky breaks, including ordering from Keith at fortuitous times, I have a decent reserve of 8x10 film in the freezer. But it would be tough to resupply all that now, if I had to. It's even difficult for me to decide to order a single box of 8X10 Porta 160 for sake of a few more 8X10 internegatives from old chrome shots. Mostly now, I just shoot 8X10 Ektar instead, and print directly onto RA4 media, if I happen to have an 8x10 itch. But I've still have some exceptional old 8X10 chromes which have never been printed yet, which deserve high-quality color internegatives, and printing them (especially onto Fujiflex Supergloss). But it's simply impossible to print all the good ones. That would take another lifetime. Fortunately, I did about 25 yrs of Ciba printing first.
More often these days, I'll sort through old sheet film chromes and select out ones for making exciting black and white internegs. They provide a different look in print than straight black and white shots. Have one of those ready to print in the darkroom right now.