You are looking for 15mm mini's I assume so I will shorten your list considerably. I have built 100's of minis from may manufacturers.
Old Glory - made in the USA, A+++ quailty, tin (My favorite mfg)
Skytrex - Old Glory's UK distributer, tin
Gaming Models - made in USA, so-so quality, resin
Peter Pig - Made in UK, A++ quality, tin
Battle front - Made in asia, A++ quality, Pewter
Plastic Soldier Company - Made in UK, A++ quality, plastic
Zvesda - Made in USSR - A+ quality, plastic, assembly can be a issue
Quality Castings - Made in USA (I think), A++ quality, pewter
I hope this helps. Anything else?
I've always wanted to go to Switzerland to see what the army does with those little red knives.