You can't go wrong with a Klyne preamp. That said, your 6LX3 is an earlier version of the 6 series units from Klyne. The 7 series is more expensive, the 6 series are more affordable. Just as with any other line, you have to pay a lot more money for small improvements. Whether the price is worth it to you or not is up to each individual.
I agree with Qdrone, Klyne phono stages are something special.
I agree with Qdrone, Klyne phono stages are something special.