Best Full-Function Preamplifier

Depends on your other equipment but the Pass XP-32 is my current favorite.  Pair that up with a good $2k phono amp and you are set.  

The Sutherland N1 preamplifier is the pinnacle of a full function preamplifier. They occasionally appear on the used market.  As its name implies: "all-in-one." 

@dodgealum 

Re: Accuphase C-2300. It has a full function remote control. 

Essential, Accuphase, Atmashpere, all good choices, great choices actually. 

I would advise you to look at the Supratek web site. I have what some would consider pretty close to a reference rig and use a Supratek preamp. 

If you need all in one...

Save some money and look for a Doshi V2.1 or an Audio Note M5 phono.

Separate units you can go Coincident Technology.  If you need a remote then a top tier unit may be out of the question.