Cool thanks. If I decide on doing a green colour scheme I'll probably do 158774 then. I have most of the decals for that at least. MAW decals for the grey colour scheme seem nigh on impossible to get (and I'm not aware of any other makers of such decals, although Fireball might be an option if I asked for a custom sheet) - I should have remembered that because I've looked before when I was umming and ahhing about buying a UH-1N...
I do like that shade of green on 158270 though, it kind of "pops" a bit more than the field green on 158774, although again getting hold of decals would probably be a problem. I've seen some other UH-1N models in various scales painted in a similar green on other webpages via google but the person who painted them never states what paints they used...
Thanks for the help though, at least I have some info on the colour schemes I've been looking at.