I've got enough models painted up to start playing around with the basing. These are destined for an as yet unnamed variant of March of Eagles by Barry Hilton (the quick play rules that come with Victrix Napoleonic models or available form their website here). These rules call for basing characters (officers, ensigns, musicians, and sergeants) separately, but the rank and file troops can be based any way desired. My preference these days is for multi-model stands to make mini dioramas. Now all I need to do is decide on the base sizes.
My initial inclination is to place models on the smallest base that will accommodate, in this case 45x50mm. The pros of this size base are that I think the models look really good packed tightly together and these will have the smallest footprint on the table, leaving room for more units. As a drawback, there isn't much room for embellishment on the base...
Creeping up to a 25mm/model frontage for a 50x50mm base gives a little more room to work with without substantially increasing the amount of table space the unit will take up. Additionally, at least for the Rebs, there is room to mix in the occasional five model stand. I've seen units based this way for Fire and Fury, four models per stand for Union and three to five models per stand for Confederate, and the effect the contrast created was really nice (the second pic below illustrates this on a very tiny scale).
Finally (at least for the moment) I could go six models per stand on a 60x60mm base. The extra depth again adds more room to add details on the base and will actually be better if I decide to use any charging models with bayonets lowered. These units would actually have the smallest width at 20mm frontage/model, but this stand is heavy. The rules also focus on Combat Groups of four models for shooting and melee so it is fractionally tougher to figure out how many groups you have at a glance.
Ok, I've got plenty of time before I need to worry about making a choice but if any of you have thoughts on the matter, I'd love to hear them!