Hi Matt,
I believe that XLR cables are technically better than RCA's and I have a controller with XLR pre-outs so I've run all XLR to my DSP and from there to my amp. However, I went to great lengths to find the most affordable basic but decent quality XLR cables with Neutrik connectors that I could find. In fact I ended up buying them from a music and pro audio store rather than a stereo shop. No unobtainium or even expensivanium for me!
Having said all this, for short runs of cable the XLR probably makes no difference compared to the RCA. On the other hand, there's a lot of wiring and channels of amplification for the LFR's alone. Add in my HT setup and its additional required cables and there is quite the twisted mess of spaghetti behind my system. I guess the XLR is a relatively low cost way to reduce the potential gotchas that might arise from this!
