The phono stage plays through your line stage so while a phono seperate might give you some flexibility in terms of gain and loading options, you probably will not have much advancement in sound quality.
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I have used a RB980bx and a RB1070 with a Rega P25. The phono stage I used was a Clearaudio basic. At the time is was nicely priced but I think the clearaudio prices have gone up.
I don't use the basic anymore but it is a 230V unit, I don't know where you live but it could/may be nice upgrade. Now I use the phonostage of my Symphonic Line La Musica.