Preamp choices:Short list


Ok so I want to transition to a truly balanced system. My current components are single ended only. I have 3 choices of pre's: BAT vk-42SE, BAT vk-23SE or Rogue RP-7. Are there any clear front runners? (Note the 42SE is older, carries risk of servicing?). Thanks
jimbones
Why only those three?  What pre are you using now, and what sound characteristics are you most looking for?  Budget?  You really didn’t give much to go on here to form a basis for a meaningful recommendation.  
@soix  I am currently using a Modwright LS100 (with all NOS tubes) and Wells Audio Inamorata. I like the sound of a tube pre. I have not found solid state to have the fullness in the lower mids. I have tried some solid state but they tend to sound thin. But the bass in SS is better. The Wells is a SS amp that has "tube like" qualities. Sonically they sound good but I am getting noise. Now here is the kicker: I am getting older and want simplicity and reliability in my system. I don't want to be screwing around with tubes and chasing down issues. Also I can't lift 75lb amps any more. So I am in a quandary, I like a certain sound but may not achieve it the way I am going. My first preference based on this is a SS Pre and Class D amp. If I can't do that it's a tube pre with Class D amp. My speakers are 92db efficient I run 2 GR Research subs driven by Rythmik amps. I hope I covered everything. Thank you for taking the time to consider. (BTW, @yyzsantabarbara suggested Benchmark, the only reason I am not jumping on their pre is I am afraid of it being analytical sounding and far from tubes. They do have a trial so there is no risk.
You might want to give Decware ZEN Triode preamp a listen, made here in the USA with lifetime warranty to original purchaser, $2,995.00 custom made, they only start to build it after you order it truly a work of art, no circuit boards all hand made.