Just replace the ENTIRE LINE, leave nothing of the existing
line....!!!!!!!

if you want overkill and PEX is permitted in your area......

Run the PEX inside a PVC line from curb to meter....

this minimizes digging in the future and protects the line from
mechanical damage. if the PEX ever has a problem just dig at each end
and snake a new line thru the PVC, use schedule 40 for added
durability....

I wouldnt use copper too many people are stealing it