In reply to ARussell:
Get my that is light enough and fits you well.
the lighter the jacket, the less robust.
also, the WP solutions differ greatly. Some are Ok, others… well you get wetter from sweat than had you not have any jacket on in the rain .
some nearly there solutions like really water repellent windbreakers might be an option.
for What it’s worth I have a Haglöfs Proof thin rain jacket. Not as nice as proper 3L GorePro, but has felt better than the Precips I’ve had.
oh, also look at Biking brands and Mountain running brands for options.