Who knows, maybe 90bow/90cold is ok build. At least you will have better defense than 90bow/90fire and you can freeze ppl.
Yes you can take nukes for fun, but they cost a lot of sp and don't make very big dmg.
To save on sp you could leave light and fire to 60. Or light68/fire52 for little bit more speed

Edit:
Quote:
thanks but i dont want 4 masterys! Not even 3 im asking wats better pacheon/fire or light or cold
sry, i didn't see you wanted only 2 masteries :d
for 2 masterys only i also think bow/light is best because grinding without grass walk is really annoying.