High Output Preamp for First Watt SIT-3?


I'm new to the audiophile world and recently purchased a First Watt SIT-3 with Magnepan .7s.  I have a Mytek Brooklyn Bridge for streaming, though I prefer to play vinyl with my Mofi Ultradeck.  The Mytek serves as the phono stage (69dB gain for MM?), and I don't use a preamp;  the Brooklyn is connected directly to the First Watt. 

I understand that the SIT-3 is only 11.5 dB of gain, and that's extremely low compared to most amps.  I like most everything about the system except for the fact that I have the Mytek maxed out volume-wise many days.  Certain LPs are cut quieter, and I wish I had more power.  There are times streaming where the Maggies aren't getting to their sweet spot.  I realize the Maggies are a lower sensitivity speaker. 

What should I look for in a preamp to fully drive the SIT-3?  Eventually, I'd like to replace the phono stage instead of relying on the Brooklyn.  Is there a tube preamp featuring a phono stage with sufficient output to drive my amp in the $4k range?  Otherwise, I'm eyeing the Modwright PH 9.0 and a linestage preamp, realizing that this will probably be costlier.  I'm looking for a warm sound, not analytical but engaging. 

Any help is greatly appreciated.  I'm a working musician with a basic understanding of related electronics but little experience in this world. 

murphbass
Gotta say, the XA25 is an excellent choice and shoots much higher than it is “rated”. Pass very conservatively rated the amp with a .01% THD wattage measurement, at the typical 1% THD measurement it’s actually over three times higher. It really is an excellent amp. Very high bias Class A operation, runs hot, but not a blast furnace. Best thing? For a Class A amp it’s tiny. But a power house. 
the SIT3 only requires 3V to full output/clipping. most digital sources exceed that alone. It’s a low gain amp and low power, but should be able to be driven by most anything. I have a SIT3 on its way and will be pairing it with the PASS XP12.
I am currently using the XA25 with it. Was told I just need to turn it up higher than most other amps, yet it will still be all attenuation as I’m coming off a DAC in balanced mode, 6V

@mikem,
If you are so inclined would you post your listening impressions/comparison of these two highly regarded amplifiers?
Charles
@charles1dad , Will do !  looking forward to breaking it in and hearing what all the fuss is about... !
Have a good weekend !