I hate plastic spinners and always get aluminum now. They're a tad more expensive, but I find they hold the prop tighter and are nicer to look at.

If you choose to go aluminum, get a Great Planes or Tru-Turn spinner with the correct adapter.

Great Planes:

Spinner - http://www2.towerhobbies.com/cgi-bin...&I=LXK231&P=ML

Adapter for 46 AX - http://www2.towerhobbies.com/cgi-bin...?&I=LXK235&P=V

Tru-Turn:

Spinner - http://www2.towerhobbies.com/cgi-bin...?&I=LXKD64&P=7

Adapter for 46 AX - http://www2.towerhobbies.com/cgi-bin...?&I=LXKE02&P=V

I'm guessing the adapters for the 46FX will work with the AX.