I am a really big fan of the Donnington New Era range sold by Ancient and Modern Army Supplies. Great value, you can choose individual figures, good pics with descriptions of the gear the models have, and multiple variants of most of the models with different helmets or weapons. They paint up really nicely too - no headaches with miscasts or unidentifiable blobs.
The Wars of the Roses and Hundred Years War ranges would have lots to offer, as well as their Swiss, Burgundian and Low Countries ranges.