in buffalo ny some thoughts:
WHO will be doing the work?
WHAT is the ordinance requirement for your town? what does your roofer
say?
WHE for what climate? not so many roof gutters in the desert climate
of las vegas, for example. how much rain/snow will help with your
answer.
WHEN you install the roofing and/or gutters consider automatic heaters
if icing is a problem. the quantity of attic insulation directly
affects the icing.
WHY not check with the neighbors similar homes and see how they deal
with rain and icing successfully.