I think it comes down to the quality of the build. I wiegh around 200# and I ride around 130 miles a week in the city-and the roads around here suck. I ride some mid range lightweight (420g each) sun rims with single eyelets (the model escapes me now) 32 spoke, 3 cross with no problems at all. I haven't had to true them once since I built them in the spring. I've also had no problems with some cheap Alex aero section rims which I beat the crap out of on my cross bike riding MTB trails. Machine built wheels, or wheels built hastily by someone who doesn't know or care about what they are doing on the other hand, are as good as toast under me. Won't last a month, unless I retension them myself. The cost of the rim doesn't mean anything, you are mostly paying for prestige, and maybe some annodizing or bogus brake surface machining. The base material is the same, and often the mid priced rims are stronger (and slightly heavier). No direct experience with MA-3's, but tons of guys your size ride them.