You weigh 148 and your wheels are out of true in a week? That's just a bad build. Instead of new wheels pay someone to rebuild the wheels you've got. As to your question, I think as you move up from low level mavic to the high-falutin' bling, you get steadily lighter wheels, and materials move from AL, to better AL to carbon mix. They may get better hubs as well, but I'm not positive on that one.