First off, if you want to be a successful scout DO NOT USE THE FORCE OF NATURE! Yeah it is powerful, but truth be told, you only have 2 shots. If you are not right up on your target, you are not going to score a kill. Scattergun is far better. You have 6 shots, and more distance. This helps when taking down an enemy that has higher health, and you miss a couple of shots. If you search any videos from scouts in tourneys, you will see not one uses FaN. (Not that i care what videos show, but proof is in the pudding.)
Second, BONK is basically useless. Yeah it helps you pass a sentry, great, but once you are past, what next? Use the pistol. If you can not get to a ammo pack, and your scattergun is empty, you have a secondary weapon. Plus+, if you have a enemy that has done some damage to you, you can back pedal away, with the pistol, and hopefully kill the target.
Third, to be honest a bat is a bat to me, but i choose the sandman. Why? Because when all else fails, you can stun. Stun and run, when to hurt.