this looks very nice:
SB400, 2AAs, 125g, 66 x 56.5 x 80 mm, tilt but no swivel – super compact
SB600, 4AAs, 300g, 68 x 123.5 x 90, tilt + swivel
Nissin i40 4AAs, 203g, 85 x 61 x 85, tilt + swivel
I too will be watching to see the price come down. Would think it would complement the D40/3xxx body size very well.
Source Article from http://www.dpreview.com/news/2014/04/03/kenro-launches-nissin-i40-compact-flash-with-video-light
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work. 
