I am trying to purchase a spinner for my Excelleron 90 (using a Saito 125) and am overwhelmed with all the shapes, sizes, etc of spinners to choose from:
Shape: FAI, parabolic, round, ultimate, standard, P-51, AT-6, etc.
Cost: Vary from very high to low.
Prop cut-out size: Custom cuts to one-size-fits-all-props.
Material: Aluminum, chrome covered, etc
Weight: Very low, standard, etc.

Is this mainly a choice of what looks best or weighs less, or are their special properties of each to consider (aerodynamics, precision, protection, etc). Any guidelines on picking the "right" one?

Thanks,

Alan