Suggestion used tube amp between $1,500-2,000

Thank you everyone for helpful suggestions.  LS7 I bought it used and it is on the way to me but if it is not good then I might try it for a week and will put it on eBay.  And will look for tube integrated amp.  

I have a pair of Quicksilver Mid Monos I bought used for $1000 and they are great amps.   They are good stock with EL34s but sound even better with KT66.   The best thing about them is you can use many different output tubes,  you just have to bias for each type.  They have been rock solid reliable and sound great .  Not my first tube amp, I've had several tube amps in the 40 to 50w range but the best value even new at $18965 I would consider them a bargain.

I am using my old Acurus 200x3 amp that been on the shelf collecting dust right now.  And will replace my ADCOM preamp with the AR LS7 that will be here on Tuesday?  I was thinking to keep my speaker for a year and if you guys think that I should get rid of LS7 and then purchase integrated amp to make better sound, I really like Cary SLI-80 and that might be the one I am going to get.  Suggestion please.  

you cant go wrong with Cary sli-80.

The Audio Research VS-55 is the answer!  This is the best bang-for-buck of any tube amp out there.  It can we had for around $1500 used--even less.  It's the lowest cost tube amp to re-tube of any out there.  I've had one for 4-years and I'll NEVER sell it!  My system sounds world-class for a fraction of the bucks of many of these audiophile setups.  If you're near San Diego, you can come by and audition it with me if you want.  I'd love to show it off.

btw, I did put it head to head with a McIntosh MC-75 and my VS-55 cooked it.  I was amazed!  I almost made a mistake by buying the MC-75 but the seller let me audition it in my setup first.  (Caveat, I have no idea what state the MC-75's tubes were in.  But I wasn't going to buy all new tubes for it to find out if that would improve it or not).

Now, all that being said, everything matters!  Source, speakers, preamp and amp--all of it.  I had to sift though a few pieces before I hit on this setup.  But, for me, the setup I have now is reference.  I will only change pieces out if it can improve what I already have by auditioning said piece before I buy it.  I've already made one mistake by going by reviews for a piece that didn't really cut it.