My mums part of a reanactment society, so I'd just rob her chainmail, gauntlets, open-faced helmet and blunt sword.
But, since you weren't expecting people to have a medievil armament, and I wouldn't have any bullets left for my brothers air rifle, I'd brobably get the hedge trimmer, as its the closest thing to a chainsaw I can find.
Or steal the blade out of my lawn mower, glue some wood to the handle, file it down a bit, or the massive buzz saw in the garage always works! =P
I havent really got much in the way of armor, besides a wok pan...