I think I would go with the FN 57 as well. The FN websight: "The Five-seveN Pistol is the companion weapon to the P90 sub-machine gun. The 5.7x28mm ammunition has the capability of penetrating body armor at extended ranges, yet has less felt recoil and is less prone to over-penetration. The Five-seveN Tactical is an easily concealable single action pistol with a 20-round magazine capacity. A maximum use has been made of composite materials in the frame and slide to result in an extremely light weight, 1.7 pound, design."
http://www.fnhusa.com/contents/hg_fiveseven.htm