Actual specification for L1 (BLM21) ferrite bead, for Mega2560 etc?

I've looked quite extensively for the chosen spec for this generic part, of which there are many variations! Which actual BLM21 is specified for the commercial build?!?

From just Farnell (UK) alone, available spec ranges include:

current: 200mA to 6A; DC resistance: 0.009R to 0.85R; impedance @100MHz: 5R to 2.7k.

I suppose I'd pick the highest current, lowest DC resistance, and highest impedance at 100MHz possible. Any thoughts please?

Thanks, Matt