Tube Preamp shoot-out

I'm in process of buy a tube preamp that has HT pass-through to add to my HT system. I've done some ressearch and narrowed down to BAT VK-5i, Audio Research LS-25 and Sonic frontiers Line 3 which available in the same price range(used). Now I would like to know "What will you choose among those three?"

My current HT setup:
CD Transport : Audio Research CDT1
Processor : EAD TM Signature
Power Amp : Jeff Rowland 5
Main Spkrs : B&W Matrix 802 S3

Thanks,

Supakit