Tube Preamplifier for Krell KSA200S

I want to upgrade and replace my Krell KRC2 preamplifier.
I want to go to tubes.
Speakers are Sonus faber Electa Amator II.
I need preamplifier with balanced input and output.
Some options are:
Sonic Frontiers Line 2 or Line 2 SE
Bat VK30SE or 31SE
Other suggest would be accept.