Audio Research Reference 6 or Mark Levinson Reference n32

I own a 32 preamp too.  It is currently on loan to a friend.  I now use a tube linestage and separate phono stage, but, the linestage is a custom-built job so it cannot really be compared to anything.  The other linestage that I own is a Emotive Audio Epifania, which is also fairly exotic.  Both tube linestages are more "vivid" sounding and deliver a more enveloping soundstage, but, neither have the incredible flexibility and convenience of the Levinson.  The Levinson sounds good--very smooth and poised-- but, it is a little on the dark and dull side. 

You might like a high end tube linestage, but, if I were you, I would look at a lot of different alternatives.  There is a much wider variety of sounds with tube gear than with most solid state stuff; including tube gear that sounds leaner and meaner and rougher than top solid state stuff (don't fall for the tube-gear-is-warm-and-euphonic line, it can be just the opposite).