My goal is to have a simple all digital system sounding as analogue as I can get on a modest budget. I use the Mac Mini (with Pure Music/iTunes) & Tranquility dac for most of my listening. The ATV2 is connected to the V-DAC for streaming radio from my iPhone/iPad. Right now I'm pretty happy.
Jmelvin, I'm using star sound audio points 1.0s and they really helped with a ps audio dac - better ambience cues and solider imaging. The best tweak I've come across is adding the 1.5s under my speakers - better base, clearer mids and shiny treble.