Deliberated for ages about getting the v2s over the m4s, but being a bigger guy, i decided that i needed the extra stopping power.
Weighed them this evening.
203 rotor = 210 grams
160 rotor = 124 grams
Understandably an increase in weight of 86 grams (rolling weight, though)
However the v2s were lighter than the m4s
v2 = 343 grams
m4 = 352 grams
So all in all an increase of 77grams, not as bad as i thought, but hopefully significant stopping power improvement.