Box rims; seriously they are cheap (any LBS should still have some NOS laying around) and durable under normal conditions (better than decently strong? ). I have a 20+ (was 700C upgrade when the size was phasing in) year old weinmann alu road set from my peugeot conversion laced to campy and they are light as hell compared to my current b43 set up or my HED3; I even keep the front mounted with a tire as a universal spare.