[Kenwood] Need Filter Recommendations for TS-850S

[Aidehua at aol.com]

Wondering which filter combination is best for CW and SSB.  I  currently have 
the YK-88C1 (500 Hz).  Wondering if I should get either the  YG-455C-1 (500 
Hz) or the YG-455CN-1 (250 Hz) for the 455 IF.  What are the  advantages?
 
Thanks,
Ed NI6S