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Help!! 2004 Lexus RX330 AWD Rear Wheel Bearing Hub Assembly

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I need to replace the passenger rear bearing hub assembly on my 2004 Lexus RX 330 AWD. The car makes a loud hum as you increase speed and continues at speed.  There are several manufacturers of the replacement assembly.  Some start at $30 and go all the way up to $150.  In my research I found that NSK brand is OEM.  But here is my question.  NSK offers two assemblies.  One is around $85.  The other one is around $110 but comes with a built in sensor of some sort.  Can anyone tell me which one I need?  Any help will be much appreciated!!

Thank you in advance.

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