I would love to give 'Only war' a shot myself. I have yet to find a group of people to actually try that game out. 

As for regiment, meh. I'm flexible and there are alot of fun options. Elysian would be cool. As would something like the brimlocke dragoons. Maccabi an jannisaries perhaps? Or a good old fashioned agri-world raised infantry regiment. Like vendoland 101st. Nice and basic to keep options simple and open.