I like to shoot 400. It's pretty much all I ever use. I've developed my techniue (is that what it is?) around 400. Since my cam is on me all the time and I almost always shoot handheld AND considering I'm usually out and about during the night (like some evil entity) then I gotta go 400 to be ever ready.
For me, it has the best balance between day and night. I have also learnt to embrace the grain.
Regards,
cHUCk in Melbourne
EMBRACE GRAIN :!: