Don't forget to check out IT Figures white metal equivalents - I have some vested interest as I mastered their Serbs, but their East African range is very nice indeed - Brits, germans, Masai, Portuguese, Belgians.
Avialable via Lancashire Games...as mentioned ...
When I discovered IT figures about seven years ago I could hardly believe my eyes. These were exactly the poses I had been waiting for for decades. They had all the poses the Airfix and the - then new - Revell sets were lacking.
However things looked different at close inspection. Quite a lot of the IT figures I checked did not mix well with plastic soldiers at all. I don't want to offend anybody, but they were too small even for 1/76 and quite stocky. However kneeling positions (not standing or prone) are more suitable when mixed with plastic as the height difference is minor. I definitely can recommend a look at their equipment such as guns and machine guns.
This relates to WW1 Germans, French, Americans and Russians (the latter probably more Civil War related than WW1 if memory serves). I have not seen the Serbian Infantry in the flesh so far, but I would be most happy to take a look. Regards, Pat