For rules I'd initially been looking at Dux Bellorum, but since picking up a copy of Sword and Spear 2nd Edition at Salute this year I'm converted.
I've kept the basing the same, Impetus sizes, 120mm wide, and I'll initially be looking at 10-12 units which is an ideal size on a club 6x4 table. The system's certainly taken off at Whitley Bay 3D gamers which is testament to the very elegant systems it utilises.
Some pics of the first 6 units below.
Dougie