Preamp Help

The Parasound Zpre3 and P6 have remote control that allow you adjust treble and Bass

The P6 is probably a good preamp in your price range. Good tube preamps are going to cost more than that and will have few features. 

I think the  Schiit Freya + is a great choice. 
 

You will find that bass and treble controls become less prominent as you get to higher performance gear. They tend to degrade the signal and don’t actually accomplish what they are supposed to do. I have tried them repeatedly. 
 

my rule of thumb is only upgrade by 2x or more… the Freya + fits and the Schiit is a great value for the money… I got one for fun… great value. You can see my systems under my I’d.

A lot of great advice so far.  Sometimes in life,our wants,and our budgets are in great conflict.  Life is full of compromises.  

I think the  Schiit Freya + is a great choice.

Good call. I would like to try one myself, just for fun. I don't really need another preamp.

This is over your budget but is clearly a level above the Schiit.