Tube or Solid State Preamp- BAT or AR

Dear Audiogon Friends;

I am in the process of putting together a two channel audio system and I want to get a good preamp either solid state or tube to go with the system.
I don't need it to have a phono stage. I am looking to spend in the range of $1000 to $1500 for a used but in excellent condition Preamp and I have narrowed it down to these two preamps, either a Balanced Audio Technology VK20 or VK-3i or an Audio Research LS2BMKII or MKIII(hybrid),SP-9,LS15 or any other in the AR price range. Is the Sp line better than the LS line?

My two channel stereo amplifier is going to be a Parasound Halo A21.

I will greatly appreciate your opinions in choosing which one of these two great companie's preamps will be a better choice.

Regards,

Carlos.