best preamps

Audio Research Reference 10 linestage, Dan D'Agostino Momentum linestage preamp, Naim Statement NAC S1 linestage preamp. 
I have owned all the above 3 preamps and currently using the Naim Statement NAC S1 preamp paired with the Naim Statement NAP S1 monoblock amps. 

First I had the D'Agostino Momentum linestage preamp paired with 2 pairs of D'Agostino Momentum M400 monoblock amps driving the Wilson Audio Alexx speakers, then later on I traded in the D'Agostino Momentum linestage preamp for the ARC (Audio Research) Reference 10 linestage pre and preferred this latter combo better on the same Wilson Alexx speakers. 

And early this year I went through significant upgrades with my 2ch setup and decided to trade in both the ARC Ref 10 linestage pre and the D'Agostino Momentum M400 monoblock amps for the Naim Statement gears, which consist of Naim NAC S1 linestage preamp and a pair of Naim NAP S1 monoblock amps driving my new Magico M6 speakers.
My Naim Statement gears have great synergy with my new Magico M6 speakers. They pair really well. 

The Naim Statement gears are in different leagues and is a significant step up sonically and performance wise from the ARC Ref 10 preamp/D'Agostino Momentum M400 monoblock amps combo but the increase in prices are also significant. The Naim Statement gears are cost-no-object design gears and cost a fortune, and if you have the budget I would highly recommend them. 

@jhamond987 

When you said unlimited budget, how far do you want to go? Are you looking to get just the linestage preamp or the entire setup and system? What are your current setup and system? Did you already have a setup or trying to start from scratch? 
Without knowing the rest of your gears, If you already have a setup, it's hard to make recommendations. 

Unlimited budget could mean a call to Naim Statement gears, Boulder, Tidal, MBL, Soulution, CH Precision, Burmester, D’Agostino Momentum series, etc. They can hit close close to a million dollars for the shoe setup and system.