Preamplifier for a Krell Evo 302

Hello,

I have a Krell Evo 300 AMP and I am trying to select a Preamp for it. I would get a EVO 222 or 202 if I could get one...but exploring other options such as

Audio Research SP 20
Naim NAC 2x2
Bryston BP26 
etc.

Any one has experience with different pre-amps with Krel EVO amps?

Thanks in advance for your suggestions!

Rit