Tube pre-amp with SS Classe Amp

Please help me chosing a tube pre-amp to match with SS CA-201 driving BW 804 Nautilus speaker. Currently using SS Pre-amp CDP-50.
Currently running an older Classe' DR-10 (125wpc) with a c-j 14LS/Mullards. Excellent combination. However, as always, you have to audition your prospective choice(s) in your system. Some combinations are more synergistic than others. Good luck.
Thank you for all your responses, I heard a lots of good things regarding BAT vk30, Sonic Frontier line 2, and CJ,but I am using XLR interconnect right now and don't want to change to RCA, I am looking for sweet sound non-fatigue listen for hours currently using CP-50 Classe pre-amp. Is SF L2, BAT Vk30 any better and in what way?
Also have anyone using the new Cary SPL-2002 tube pre-amp?
The Sonic Frontiers products due to the fact that they are DC coupled, low output impedence (for a tube product) and fully balanced are excellent companions to many solid state amplifiers sharing these design parameters (w/ corresponding low input impedences). The higher you go up in the line the more compatible these tube pre amps are to solid state amps. They are well built with nice convience features. How ever they tend to be more neutral and less euphonic than many other tube preamps in IMHO.
Check out the Cary SLP 2002. It's got everything you want and more. Make sure you get a discount. 20% seems about right.