The Crosman 2100xl is just a toy: pump-up bb shooter (i.e. no, or useless barrel rifling) and when Crosman "detunes" things to be below 500fps, they almost always overshoot the mark- I would be surprised if it gets to 425fps.

The other rifles are all better choices in respect to power and accuracy. The order I would go in of the rifles you mention; 1) Diana .22, 2) Beeman QB, 3) Fusion2 (actually, I would avoid this due to the cost of 88g Co2 cartridges and the lack of ease of obtaining them)- the Crosman 2100 I wouldn't consider at all.