From my experience, Sonic Frontier is a great match for Krell. Haven't auditioned the latest Krell 202 but was never a fan of Krell preamps.
I had a Krell KSA100s with SF SFL 1 and SFL 2. FPB300 and FPB600 with Line 3/3SE+. Line 3 has a very low output impedance for a tube preamp so it will work with a SS amp.
IMHO, I would buy an used Line 3 for ~$2K and get the SE+ mod from Chris Johnson @PCX. I wouldn't waste $$ on a SE ...
Line 3SE+ also benefits from tube rolling. My favorite is Amperex Phillips SQ e88cc and Ediswan CV5065's.