Pre amp recommendations

You don’t say what your price range is, but I highly recommend the ARC REF6.  It is a phenomenal preamp and is a perfect complement to my Pass Labs 250.8 amp.  It just sounds great.  Now I will only point out that when I have changed preamps or amps, I have been hyped up on big differences, but the reality is that most of the time there are definitely differences, but they are not night and day.  I mean that one pre will definitely sound “better” than another, but to me, that has been an incremental difference.  Really the one component that I put into my system that really kicked it up to another level and filled in some of what I felt was lacking — namely depth of soundstage — was a Shunyata Everest power conditioner with a Sigma XC power cable.  I was super surprised that it made such a difference!

Audio GD  HE-1 XLR with 10 tubes and it's own regenerative power supply....$4500....Plays with the 10 K crowd. Awesome unit.

Ok,  I ordered a BHK pre and waiting for it’s arrival. 
I want to thank everyone for their input.
 I realized I should have upgraded my streamer first but the deal I got on the pre I couldn’t pass up. The streamer is next and will be another discussion. 
I seriously considered everyone’s input. It helped me make this decision. 
I’ll give a follow up post on my results. 

Congratulations. I think a good choice. Since the preamp is very much the center of the system, better this before any other changes. Tell us your impressions once broken in.