Tube Preamps.....

I love my Eastern Electric Linestage pre-amp. You would have plenty of money left for the DAC.
Point to Point wired, exceptional build quality, nothing else comes close for the money.

I haven’t heard the Don Sachs but it looks nice plus he’ll work with you on upgrades to my understanding, a big plus. I have lived with a 6SN7 based output tube preamp up to a few years ago, still have it but it doesn’t hold a candle to my Bill Thalmann upgraded Vintage CJ PV9a in any parameter of performance. The Classic 2 SE with the teflon caps used, no longer available new is killer for the money and beyond but no remote, definitely worthy of consideration. 

I have the CJ classic 2 SE pre amp and my goodness is it good. However CJ stopped making this and now their entry model is the ET3 which is the same as Classic 2 but with remote control. I can not sing enough praises on this pre-amp, I’ll probably never upgrade.

shrapnel: the CJ ET3 and Classic 2 preamps are completely different designs, with no relation other than they were both designed and produced by CJ.  The ET3 is based on technology used for the GAT preamp while the Classic 2 is essentially an update of the PV-10BL preamp.  Both are great amps but were designed for different user expectations and different price points.

patores: personally, I would take the advise of the others who have advised you to skip the preamp/DAC combination.  To paraphrase Peter, Paul and Mary "Preamps live  forever but no so little DACs..."