The best thing would be to find someone local that will let you audition one in your system.
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I agree with Jdombrow, you should try borrowing one and see if the sound works for you. The "warm tube sound" is a generalization. There are incredibly transparent tube preamps, and very warm,rich, syrupy ones. And everything in between.
If you don't have any complaints about the sound now, what is it that you're trying to improve on?
Some options in about your price range that I think are pretty good for the price include the Marsh P2000t and Audio Mirror T-61.
IMHO, the Thiel CS 2's are best driven with a warm ss amp. With that said, as suitably compatible tube pre is a very good idea. With your budget I would consider a used conrad-johnson PV 10 BL. Which BTW would work very nicely with a used conrad-johnson MF series solid state amp and your Thiel CS 2's.
I'm not familiar with your Rotel pre, but I had a Rotel RC1070 pre and while cheap, I wasn't hearing enough differences with other pres that would make me want to change, until I got a Lamm LL2. Certainly I can hear that difference, but the Lamm is like 10x the price of the Rotel. Point is don't assume more expensive will always sound better.
Hi all ! I have had 2 pairs of the CS2's . They are the easiest of all Thiel speakers to drive , so dont limit your choices on the preamp side . A Belles a150 will drive the crap out of those and can be had for $400 - $500...this amp is nice and warm sounding . Dont know much about preamps ,I have used the placette passive and a cary slp-03 for years and both were are excellent. PS... also a nice 40 - 60 watt tube amp would be a good match too.