It's most likely important to know what your current CDP is first before proper speculation can be made.
XLR interconnects do not necessarily mean the music will sound better and gear with XLR outlets are not necessarily truly balanced (although Im sure your amp is).
XLR will sound louder with you volume set at the same level as with RCAs, but not necessarily sound better, although in some cases XLR will sound better (and cost more).
Many times XLR interconnects are used in longer runs to prevent interference.
XLR interconnects do not necessarily mean the music will sound better and gear with XLR outlets are not necessarily truly balanced (although Im sure your amp is).
XLR will sound louder with you volume set at the same level as with RCAs, but not necessarily sound better, although in some cases XLR will sound better (and cost more).
Many times XLR interconnects are used in longer runs to prevent interference.