Last week at the club, two chaps were playing FoGR in 15mm and using Danish vs Austrian/Empire, both armies from around the 1690's. This is roughly the end date for FoGR, so just before things move fully into the horse and musket era. They used Dixon figures and some other bunch whose name I've forgotten.
I didn't think I wanted to go 15mm for the GNW, but the mass of figures looked good on the tabletop. I'm trying not to listen to the voices ... the Claymore show is on in Edinburgh this weekend ... but I'm nearly sold on doing armies in 15mm.