different approach to my cd player dilemma

thanks for all info on past question,see interested in moving to dac, last week,how does tube output stage effect the equation?been looking at sony 9100 es with mods by modwright,there platinum signature addition,is this money well spent,a bit more than budget,but could sell some old gear to come up with extra,4300.00,thanks again ahead of time as always 2 heads are better than one,robin