This is good advice IMO, and what I did. I'm down to 3 very good DAC's for main systems: NAD M51, Neko D-100 Mk II, and the coming NuWave. One small desktop DAC for work, the Micromega MyDAC. I also have a UDAC 1, UDAC 2 HP, & HDP from Nuforce; and an Audio Engine D1; the smaller non-powered ones I can use for travel. But even those extras will be cut down a bit, or more likely lent out to friends.
I think i peaked at about 12-13 DAC's at my worst. You just can't use that many, they end up sitting around collecting dust. I can at leats say all my nicer DAC's (the first 4) are in use in various systems.....