Advice Needed on Suspension Upgrade

[Bob in Philly]

I've decided to upgrade the suspension on my 2000 Boxster S, but want to do so
with as little sacrifice in ride comfort as
possible.

Should I just do sport springs, such as Eibach, H&R, etc., and stay with stock
shocks? If so, which brand is least harsh?

Or, should I do sport springs and shocks
and, if so, which brand(s) will improve performance without causing too harsh a ride on poorly repaved city streets?

Thanks in advance!!