Hi Mclsound,
Thanks to you, and to everyone who replied, for your input.
I ended up buying the LS26 about six weeks ago, and it is just fantastic. Absolutely a whole new level up from my old pre, the KRC-HR, in every possible way.
Given how how much better the ARC seems to be than the Krell, I'm very tempted now to explore the possibility of replacing my Krell power amp (FPB300) with a tube power amp. An obvious contender would be the ARC Ref110, but I might go with an older used ARC like the VT150, as that would save me some hard earned cash.
Cheers
Mick