I think 7-9 is ideal, but 6" might work as would an RMD (IMO). He's not quite sure what the purpose is, making it hard to guide his choice. He wants a fighter that chops and batons well and shoots rainbows and pixey dust out of it's pommel...
JYD #126 Super JYD #13
"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety."