I seem to have a problem of denting the rims on my rigid 1FG. Is it worth it for me to put disk brakes on this light thing just to be able to have a smooth braking surface, or should I just invest in a stronger set of wheels?

If I were to go to disk on front and rear, what would be the lightest cable actuated that I could get?

BTW, I'm 6'2" and about 173 on an XL frame.