DAC upgrade

+1 on the Audio Mirror DACs.  Just recently acquired the Tubadour VI and it's sublime!  I look forward to it breaking in and sounding even better.  Very natural and musical DAC.  I would seriously consider contacting Vlad as he's the sweetest guy you'll ever come across.  I can only imagine how his flagship Wave DAC sounds.  It's within your budget and there's one at a steal of a used price on USAM now.  

Take a look into Vitus DACs, which are known for sounding warm. Might be a great match for your system. I own the Masterpiece DAC and am very happy. 

That system is tuned for ultimate resolution with all the Nordost and AQ Dragons. New DAC in $20k - $25k range should be a definite improvement over the DAVE. Get a new DAC and may be as a next step revisit your cabling to mix in some warmer sounding interconnects or speaker cables. 

This is a nice setup. I love my krell ,dagostino stuff.ill bet it sounds fantastic and love others input that is a non biased review.enjoy the hunt and keep us posted.modwright has his tube module you can plug anywhere in the system.im going to have to try mine.

If it fits your budget, I’d totally go for the Lampizator DAC.