Acrylics work well for me too. I don't worry to much about the brand but more about finding the right color. Some of them make some really easy work for those of us that can't mix well. For example Chevy Engine Red, Turn Signal Yellow, Wood, Leather, Rust, etc..
Instead of mixing "red" and "brown" with a little "black" and hoping it looks right when it dries.
Could always be better, but life is good in paint land..
Check out this list from Testors Poly Scale line:
F505350 Floquil - NATO Tricolor Black 1/2 Oz. $3.99
F505352 Floquil - NATO Tricolor Brown 1/2 Oz. $3.99
F505354 Floquil - NATO Tricolor Green 1/2 Oz. $3.99
F505110 Floquil - Panzer Dark Gray 1/2 Oz. $3.99
F505111 Floquil - Panzer Dark Yellow 1/2 Oz. $3.99
F505112 Floquil - Panzer Red Brown 1/2 Oz. $3.99
F505113 Floquil - Panzer Olive Green 1/2 Oz. $3.99
F505200 Floquil - Rust 1/2 Oz. $3.99
F505202 Floquil - Dust 1/2 Oz. $3.99
F505204 Floquil - Grimy Black 1/2 Oz. $3.99
F505205 Floquil - Dirty White 1/2 Oz. $3.99
F505206 Floquil - Mud 1/2 Oz. $3.99
F505208 Floquil - Dirt 1/2 Oz. $3.99
F505210 Floquil - Old Concrete 1/2 Oz.