I've just been reading this article over at Anandtech, a new 300w, 80+ Gold PSU from Huntkey. I hear a few grumbles after some of their previous models but the review for it looks excellent, 85% efficient down at 10% load - that's 30w! This could be an ideal step between a PicoPSU and a 400W+ PSU for low-power systems, since PSUs tend to have terrible efficiency down at these loads. I don't think I'm completely confident until I see another review but this could be one to watch!