Might I recommend you take a look at the range of 18 mm figures from Blue Moon? You can get all you need - except the buildings - for a relatively small amount of money. I have them all, not yet painted, and they are very nice sculpts. And you get plenty of civilians. Don't forget, the so called cardinals guard can be used to reinforce for both sides, the musketeers as well as the cardinal's forces. Fear not the smaller scale!