Here is battalion of early period French infantry I did earlier this autumn (aproximately 32 figures). The majority of the models are Victrix plastics which are fiddly as hell to assemble but pay-off in the end with being able to customize every pose. For example, in this battalion I have made a large portion of the soldiers cheering, lifting their hats and muskets in a salute to their commanding officer. Only a few years ago it would have been virtually impossible to compose a unit like this without a hellish amount of conversion work. Now it's pretty easy.
I use 30mm (w) x 50mm (d) steel bases to allow greater depth for additional models and terrain. (Four figures per base.) It adds visual interest and helps to protect fragile bayonets, outstretched arms, etc. I also like the narrower frontage (15mm per figure) as it seems to give a more realistic, compressed look.
The one thing the deeper bases do is leave gaps between the ranks in column formations. I mask some of this by placing figures and terrain into the dead space in order to better tie the two bases together visually.