I have a friend who suggests the Nexus G-rider, which I am planning on buying. It vibrates nicely, but I don't know that it would make a good option for long term wear. I'd say using during sex is good, but it seems a bit awkward for walking around with like some people like to do with regular plugs.
The PicoBong Tano is also a vibrating plug that looks a bit more discreet for wearing long term, but I hear the seam between the silicone and plastic can hurt if not sanded down before use.
Hope this helps, but personally if you mean to wear a toy around the house, which many people do, I'm not sure that a vibrating toy would be good for that.