Preamp Question

I would like recommendations on preamps.  Here's my issue.

I have an Elekit 300B SET amp.  It only has one pair of line level RCA inputs.  I run two different sources--vinyl and digital.  The Elekit does not have a remote. 

I have a Schitt Freya preamp that is really something for the money. It has a remote.  But, my Manley Chinook phono preamp and Doge 7 tube DAC both sound better running direct to the Elekit amp.  The Doge has a volume/attenuator and remote so when I'm using that I'm in good shape.  

So basically I'd like to use a preamp to add remote and 2 line level inputs for convenience either without reducing the sound quality or even improving or changing it for the better.  Budget would be $2-4k new or used is fine.