Marantz 8802a > looking for better two channel

Curious on people’s opinions and experience. I started out more into home theater but recently have been getting more into two channel. I’m running the marantz biamped into lexicon RX-7 into revel studio 2s with a pair of JL Audio fathom f212v2s.   There are basically no places to demo equipment where I live but I’m curious what level of two channel preamp it would take to be a significant improvement over what the marantz is doing. I’m running an oppo 105 with balanced connections as the main source.  While this may still be awhile out I’ve considered McIntosh mx150, lyngdorf Tdai-3400, or shoot for the moon one of the Current levinson preamps.  Also wondering if switching to any of those would then require a new amp to fully take advantage.  I plan to keep the home theater setup and do a pass through while keeping the subs in for two channel.  I like a pretty varied mix of music so not looking something thats great with classical but terrible for rock for example.