Hi, saddlesores.I'm from Guangxi China, not far away from Hainan.
I'm using power circle's P19, a single wall 406 rim,for my Dahon HSL.
I built the wheels by myself, using a 20-holes front hub (Novatech A551) and a 28-holes rear hub (by Starhubs).

my HSL is mainly used for commuting and light touring. I weigh around 70kg. It seems that 48 spokes work well, till now for about 1 yr.
I think most of the spoke breakage is caused by poor wheel-buliding. e.g. I used to have a 2010 Dahon SP8,with factory-mass-produced 16-spoke front wheel. after 1 year's riding,some spokes losed their tension, and the others got extremely high tension, that cause the wheel swings when rolling in high speed. I guess that if I didn't have repaired the wheel,sooner or later one spoke would have been broken, this never happens on my hand-made wheels.I rebuilt the front wheel and it works well again ,for a relatively long time.
If you want to build strong and reliable wheels , the most important thing is to make sure all of the spokes have been tightened by nearly equal tension.
and before a wheel is ready for road, it must be stress-relieved, and tuning. most factory-mass-produced wheels may not have been stress-relieved and tuned,for productive efficiency and cost-saving. after heavy loaded usage, difference of spoke tension will cause the wheel unstable.(for more info,refer to Sheldon Brown's website.Wheelbuilding)

you can also visit my Taobao online store,首页-阳光海健康生活馆-淘宝网。there're some wheels i had built and sold in my spare time. one of them had been sold to Hainan, bought by a young rider. enjoy it.