I have the LS 100 and it's a great piece. The only thing similar I've owned to compare it to is a Audio Research LS 26. The LS 26 is in my 2nd system.
My LS 100 is powered by Rogue Audio M-180 monoblocks. I've been considering trying out some SS amps and would be curious to hear your impressions if that's the direction you decide to go.
I don't think the LS 100 is "warm". To me it's pretty neutral sounding, not "tubey" like some tube devices I've listened to. The Rogue monoblocks also sound more like SS amps than they do tube amps. I would expect their preamps to have a similar sound signature, but have no experience with them.
The guys at Rogue and also Dan Wright at Modwright are pretty easy to get a hold of. I'd reach out to them and explain what kind of sound you're after if you can't demo the units locally.