Should I upgrade to XLR interconnects?

OP,  

In theory, balanced cables makes sense over longer runs. As you may know this, the XLR connection carries a balanced signal. The signal through XLR cable at the receiving equipment, any noise that is common to both the hot and cold pins is cancelled out. This makes a lot of sense in recording studios where long runs of cable are often needed to carry the small voltage signal generated by a microphone (in terms of hi-fi) over very long runs of cable. In a home based system, the longest interconnect is 1 or 2 meter and the signal is up to 4 volts, the need for XLR connections is more questionable. The most important thing is sound quality, and this is harder to be certain about as this very much system dependent. In some systems XLR connection sounds better than the RCA and vice versa. 

I would strongly recommend that you try both connections and decide for yourself which is the better sounding connection for you. Try good quality IC's from The Cable Company as they have a huge lending library and generous return policy. 

Get some Mogami xlr's from guitar center and check out the sound. I doubt any benefit to be had. Much gear with xlr inputs then converts to single ended. It depends if the gear is truly balanced
Alan

I checked your integrated. It is not a balanced design. It is single ended and probably will not benefit from xlr cables. Stick with what you have
Alan

No brainer. XLR should be equivalent sounding but in addition XLR negates a whole host of ground loop and other issues - so performance will always be at least as good but can often be better in many instances.

What RCA style interconnects are you using?  Both you amp and SACD player are fully balanced designs and are intended to be linked via the balanced (XLR) input/outputs.  Whether or not you will hear a meaningful sonic improvement is a question that only you can answer after trying and comparing both.  There are retailers that lend cables for you to evaluate.  Going that path will minimize the initial financial impact of comparing.