ARC Reference 6 or Cary SLP 05 with upgrade?

Yeah, it's me again. The Voyager has settled in nicely and I think I would benefit from a better preamp. A friendly local dealer dropped by today with a ARC LS28. That was headed in the right direction but was not close to a $12,000 improvement. I could probably swing a used ARC Reference 6, but somehow the Cary SLP 05 has caught my attention. Everything I read about it is very positive but I don't know if it would lend more of a full sound than increased transparency. Has anyone been able to compare these two directly? 

Currently: Bricasti M3 > Rogue RP-7 > LSA Voyager > Fyne F1-8

One of the things that appeals to me about the Cary, aside from cost, is it uses 6sn7 tubes which are now being manufactured by Lin Lai and have a reputation for great sonics.

Anyway, I await your wisdom.