What Preamps for Krell KSA 80

Was out of Audio for awhile, and now starting a new system with a Krell KSA 80,
and would like to have suggestions on what preamp would be a good match..along the lines of Audio Research LS3 etc..
Thanks !
Are you a fan of Audio Research pre amps? How much are you willing to invest in the pre? Are there any other preferences? What are the other elements of your anticipated system?
I would seek out a much more "tubiefied" sound from the pre personally.
I used an ARC SP11 with my Krell KSA 80 years ago, and was very happy with the results. I believe Audio Research's more recent tubed preamps would be a good match with that amp. What's the rest of your system?