Having written a set of rules for Pike and Shot (I'm sure that my gaming companions won't let me ignore those British Civil Wars for long!) I really should put together a collection to fight massed battles with them.
However the question of what size miniatures to use is still open.
As I see the issue, I really want a sense of mass on the battlefield, so I'm ignoring the larger scales and considering 10mm, 6mm or 2mm only.
I'm inclining towards 6mm (given I have a lot of 6mm already) but await your decision. The poll is in the top-right hand corner of the blog.
To help you to make a decision before entering the polling booth, I'm going to link to a few blog posts from others who are using the miniatures I'm considering
From The Warrior Pole
From Keep Your Powder Dry
From Fighting Fantastist