New to the two channel world - Advice needed on preamp

I am new to the two channel arena, but have been in AV my entire career. I am looking to find a solid preamp to match with my system.   I would be open to integrated amps if they are a better option.

Current Rig

Paradigm Prestige 85F’s and Prestige 1000SW Sub (Not sure if I really need a sub or not, but I have it nonetheless)
Bryston 4B-ST
Sony ZA3100ES (I know its an AVR, but it had the requisite preouts)

I listen mostly to FLAC files off of a PC. Looking to stay under $2K. Any advice for a newbie?