I can't give you specific color recommendations for green, but as far as paints, you have a couple of options that are readily available.
-Citadel. Get it at any
GW, and a fair number of hobby stores. A lot of us like to bash Citadel paint, but it's actually good paint, if not a bit pricey, like anything
GW makes.
-Vallejo. Their Game Color line is a very good match to the old Citadel colors, comes in dropper bottles, and is at least as good as Citadel, and less money, as well. Over the last couple of years, I've been replacing my Citadel paints with Vallejo. You may have to order online, but the dropper bottles make it worth the wait.
Reaper. Not as big of a range, never used them, but many here do. In addition to Reaper, the other bigger names are Cote D'arms and Army Painter. I've started using Army Painter washes, and like them much better than Citadel.
Here's a link to The War Store. Good place, good service, they carry most anything you'll need:
http://www.thewarstore.com/