@Oso Rojo, the SFG standard is a pair of 24 kg bells. That's a good place to start and, IMHO, if it's good enough to make you an SFG, then it's good enough. I believe it's a pair of 24's for 5 reps as a test, so being able to do it for 8-10 reps would be good.
Being able to clean and front squat a pair that's just under your bodyweight for a rep or two is also a good goal. I remember some of my teachers at my first kettlebell cert, in 2003, commenting positively that I could clean and front squat a pair of 32 kg bells @ 67.5 kg of bodyweight. The same weight on a barbell for FSQ is significantly easier.