I've made a deal to have my water main pipe replaced and the guy said
he'd do either 3/4" or 1" copper, and pretty much left it up to me. He
said he'd test the water pressure and if it was over 65 lb. he'd install
3/4", otherwise 1". But he said he'd do 1" in any case if I request it.

The run appears to be around 60' from the meter out front to the point
in the house where the water currently enters. Interior piping is all
1/2" galvanized, and most of it pretty old (1914-ish house), and pretty
corroded inside, although pressure seems good when no other water is
being used. Typically, if you're taking a shower you better hope noone
flushes a toilet!

The utility company tells me that the meter out front is fed by a 5/8"
line from the main street-water-supply.

I have two bathrooms.

Should I ask for 1" copper for the water main line (presumably L, since
it will run underground) or is this really overkill? TIA.

Dan