Should I switch to a preamp with balanced outputs

Years ago when I had a Threshold T2 preamp and a Threshold T400 amp, both had XLR and RCA outputs. I had two dealers willing send me VERY expensive cables of both types. I experimented with every cable until I was blue in the face.
In short, I could here no difference in the best RCA cables verses the inexpensive RCA cables. The Transparent Reference XLR cables made the biggest difference. Instruments had more air and separation around them. More meat on the bone too with deeper bass. I had settled on the transparent reference as the cables I thought I'd die with. After a divorce, I sold most of it to buy a house. I now see transparent selling cables for STUPID amounts of money. I'm using Transparent Super XL balanced these days. I do see that the older transparent cables hold their value rather well. If you can be happy with what you have, then good for you. Try not to let it drive you crazy. Good Luck. Joe

If your current combination sounds great to you, $700 certainly will not bring a huge benefit that you are seeking.
Just enjoy what you have, and don't worry about RCA/XLR.

Agreed, keep what you have!

Thanks for all of the replies! I think my question has been answered.

The only reason to use XLR is if there is no other option. I have switched to ARC, which only has XLR inputs on a power amp, so no choice. What you have to avoid is RCA to XLR conversion cables, that will degrade the sound