The next consideration (and most important to me) was how the bases would look when in play. Might & Reason uses two formations: March Formation(MF), one base behind another and Fighting Formation(FF), bases side by side. This means that any formation I use must be symetrical if it is to look uniform when in both formations.
Here are some pictures of the various options I looked at; showing veiws from the front and above in both formations.
This formation looks fine, in line but only if using a single brigade. I like having the officer on the end of the line and the drummer and flag centralised.
Again, good in line as a single brigade.
I like the look of this "in line".
I don't like the possitioning of the flags.
This is one of my two favourites (with the next formation), it's symetrical, looks good in FF and MF.
This benefits from a couple of less miniatures, it looks good in MF but I'm too sure about FF, the middle of the line (drummer next to officer) looks a bit 'off'. For these reasons I think I will go with the previous formation.