Tellyho, you are saying I should upgrade to a cartridge bearing BB? What are the pros of that? (that the BB is rebuildable in the future?)

I am not updating the crankset. An older bike and while I'd love to upgrade things, I'm going to sit on my hands and bank account and just save my money to get an entirely new, modern road bike in a year or two. This one suits me pretty well, as I ride for fun/leisure/stretch my legs.

What type of cartridge BB do you suggest?

I'm having trouble finding a UN-72 in 68x110/111mm. Anyone know a source?
(I can find lots of UN-52s, but not the UN-72)