[guppysb]

Hey guys,
 
What I own:
 
Studio Monitors:
2x Behringer Truth 3030A (Love them!!)
 
Headphones:
Sennheiser HD595
Beyerdynamic DT770 - 32 Ohm
Beyerdynamic DT990 - 250 Ohm
 
Amps:
Maverick Audio Tubemagic D1 (GE getter tube and 2x LT1364 Op Amps)
Fiio E17 
 
Sound Card:
Creative X-FI Titanium HD
 
Stereo Direct Box (convert unbalanced rca from D1 to balanced XLR for Behringer Truths):
Rolls MB15b
 
My Current Configuration:
 
My current configuration for Behringer Truths 3030 studio monitors:
X-FI Titanium HD (optical audio out)> Tubemagic D1 (optical audio in to rca tube out) > Rolls MB15b (rca in to xlr out) > Behringer Truth 3030a studio monitors (XLR in)
 
My current configuration for Beyerdynamic DT 990 headphones:
X-FI Titanium HD (optical audio out)> Tubemagic D1 (optical audio in to 1/4" Headphones out) > Beyerdynamci DT990 250 Ohm headphones
 
What I want:
 
After seeing what I have, I would like a recommendation for a good tube amp. 
I hear the headphone out stage Maverick Audio TubeMagic D1 is not that great. I would like a more fluid/smoother sound from a better tube amp for $300-400 range. I am considering the Alo Audio PanAm or the LIttle Dot mark III. 
 
I don't know if either of those would give me substantial sound smoothness. I will not say increase in sound quality since that is dependent on my source (FLAC audio). 
 
Would you guys have any recommendations for me to get more out of my audio equipment, mainly the DT990? I am open to changing configuration or directly using the DAC on the Titanium HD instead of doing optical audio out. Please let me know any recommendations you guys might have.