For most clean chords the RY bridge would be a bit bright and agressive in my book, but the Mule neck and IT middle especially (the SC qualitys really come out when played clean) work well for my tastes.
I think the Mule does deliver the singing, soft and warm leads too, but then again I have heard much good about the MQ neck, I hear it is awesome.
I am not sure which PU is right for you now, but I am rather certain about the IT, as telerocker recommended as well.
For me versatile is that I can not only play clean and dirty, but also cover a lot of ground tone wise, fitting a lot of different styles. I got a bright and a dark humbucker + a SC, Vintage and modern (vintage leaning though), one HB agressive, the other soft, etc.
Just a lot of variety in general I think.