Mix of RCA Balanced Cables. Is it ok?

No, I don't think so. I have a BAT VK50SE and a BAT VK60. I have balanced from my CD and analog sources, but RCA from SAT and DVD. They sound fine. The balanced does help, if the components are truly balanced. Stick with balanced where you can, but it's not life or death.

The above advice is good - if it is a long run cable then balanced will help with picking up noise along the way and sometimes it will add some gain to the situation which may benefit your components - otherwise it is just one of those extra deal/cost things.

I agree with Jfrech. I have my Aesthetix Io phono stage running balanced to my Aesthetix Callisto preamp. The Aesthetix pieces are true balanced and work well that way. My Wolcott amps are single ended design, so I choose to drive the 11 meter run as such, and it performs flawlessly. As mentioned by Jfrech, the pieces that are truly balanced may benefit from being run that way, adaptors may even hurt the performance.

Thanks pple, for your contributions so far. Is it wise then to convert from RCA to balanced?

An RCA to XLR adaptor will not convert the audio signal from single-ended to balanced. The adaptor simply allows you to mate different types of connectors. There are real sonic advantages to fully balanced equipment. For interconnects, a balanced cable will have better RFI/EM rejection and balanced amplifier circuits typically have lower distortion than comparable single-ended designs. If you have such equipment, then by all means used balanced interconnects.