Chas,
Are you looking for a specific period? A particular scale? What cpuntry do you want to represent? There are a lot of resin figures out there from various periods.
In addition to those mentioned above, Michael Roberts covers a wide range of eras in resin in several scales, Pegaso has some 1/35 WWII figures in their Platoon series, Bravo 6 has a bunch of Vietnam era figures, many based on the characters from the movie Platoon,
SuppressionFire:
Andrea is a Italian(?) not sure... company the specializes in all types of resin figures from all ages.
Whle Andrea has some resin bases for some of their figures, the figures are all white metal. If you have a resin "Andrea" figure, you hve bought a pirated copy.