What would you do?

So, I want to tweak the sound of my system (Hegel 160 integrated, Cambridge CXC transport, TAD tube DAC (pretty old), Joseph Audio RM25Mark2 XL). I want to increase soundstage and curb a slight tendency for high end harshness.  I know that soundstage is mainly in the mastering of a CD.  And I know that the room plays a big role but I can't make changes there. Just retired and "need" to give myself a present (up to about $3,000 new or used). Have been thinking about getting a new DAC ( Audio Mirror Tubador 111SE with Balanced output).  But wonder if the money would be better spent elsewhere. Your input would be greatly appreciated. Thanks