I have owned all of these cables and still use the KS-1130 and KS-1136. That said, I have always thought the KS-1126 to be the "sweet spot" in the Kimber lineup and I think it would work very well as a 5m run between your preamp and monos.
I actually preferred the KS-1126 to the KS-1130 between my preamp and amp but preferred the KS-1130 between source components and the preamp. I feel the KS-1126 has a bit more weight and body while the KS-1130 is somewhat more delicate and nuanced.
The difference between KS-1126 and KS-1136 is apparent but not dramatic and they are more clearly cut from the same cloth than KS-1130, but that is no detraction of it.
I actually preferred the KS-1126 to the KS-1130 between my preamp and amp but preferred the KS-1130 between source components and the preamp. I feel the KS-1126 has a bit more weight and body while the KS-1130 is somewhat more delicate and nuanced.
The difference between KS-1126 and KS-1136 is apparent but not dramatic and they are more clearly cut from the same cloth than KS-1130, but that is no detraction of it.