All in One DAC/Pre/headphone amp vs Separates

Current top end: PC to PS Audio DLIII DAC with Cullen upgrades to Audio Research LS8 tube Pre to Ray Samuel Raptor tube headphone amp.

Status: the LS8 finally went to audio heaven so, the question

buy another tube pre-amp and plug in or....

Buy one of these new all in one type gear, looking at

B.M.C. Pure DAC
Grace M903
April Music Eximus DP1

Thoughts, assistance appreciated. Have a hard time giving up "tubes" somewhere in all this digital world.

THANKS