I'm currently getting another set of Mavic A719(previous were T519,same thing) custom built. The Dyads looked appealing, but I guess I'm old school ... I like double eyelets. My opinion on the Dyads is they are very good rims ,perfectly capable, but the A719's are just a step above. The welded joint makes for an awesome braking surface. 11 years with my T519's and they areas good as the day I got them.

I wouldn't let the cost of the rims decide for you. Get what you really want.