How to set Motorola SBG900 to 128 wireless encryption?

I have a Motorola SBG900 modem/router.  When I go into wireless then security tab and basic, I have the settings below.  I'd like to use 128-bit encryption but it keeps going back to 64-bit when I click apply.  Do I need to do something different?

Also, what is a newer recommended modem/router for Comcast cable that uses WEP2?  Or does it matter by provider?  I'll be moving soon and will have a different cable Internet provider.
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You should use WPA instead of WEP, any reason you want WEP?

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