Decision Decision Decision between Cary and Audio Research Sound

Eddy, 
In general the Carys sound similar to the CJ stuff that you are moving away from. 
I'd suggest trying the LS7 with a better amp like advertised
Ads for Rogue Monoblocks 150s or the  Music Reference RM200. IMHO, monoblocks will help with soundstage/imaging by minimizing crosstalk between channels and separate power supplies. Cheers,
Spencer

"Or if not even related to Carry or Audio Research, can be any brands,  Would you prefers Warmth or transparency sound and why?"

As far as warmer or more transparent it would depend on you current speakers and cables along with your preference in sound. When I had my Octave and Dynaudio C1 Sigs I preferred a warmer sound (loved original Tung Sol 6550 solid black plates or SED KT88's). Then when I replaced the Dyn's with Raidho D1 and later D2's I preferred a more transparent sound (Ei KT90's and original SED 6550's). The only tube I hated was the TS KT120 with either speaker. That said that is the beauty of tubes. When I wanted to change up the sound I swapped out some tubes

Eddy ...

Why not pick up a used ARC Classic 30 or ARC Classic 60 to pair with your preamp?

 Also, if I were you, I'd forget about "warm" or "transparent," and just concentrate on what music really sounds like when you hear it live. 

Have you ever seen the original version of "The Wizard of Oz?" That movie was made in the old Technicolor days ... beautiful to look at (warm), but not true to life. Everyone loves Technicolor movies ... but break away from the movie and walk outside into the environment. That's realism.

So, then Eddy, the challenge you have is ... do you want the distractions of Technicolor, admittedly with its unique attractions, or do you want realism like in real life? 

I submit that what you refer to as "transparency" is more true to reality, and will be more satisfying over the long haul. 

And by the way, as an owner of an ARC Classic 60 for over 30 years, I can tell you that it has its own special musicality. Not near as "transparent" as the ARC REF amps of today, but addicting nonetheless. And the ARC CL 30 is even a little sweeter sounding than the ARC CL 60. 

Happy listening ... 

I would highly recommend the Cary over the ARC integrated amp, but like the previous poster, I have a great fondness for the ARC Classic 30/60 series of amps.  IMHO, some of ARC's most musical amps. 

Thank you so much for everyone suggestions.  If I am going to buy a used once, how can tell if I need a new set of tube.  

What is average set of tube cost for ARC Classic 60, Cary SLI-80, and Rogue Monoblocks 150 incase I need new set of tube.