Looking for DAC for mac min 2000$

if you've considered using firewire, you should absolutely checkout the Weiss DAC2. Used price is right in your wheelhouse.

im selling an M2 Tech on Ebay, i cant post link here but you can search for M2 Tech or my username pearlcfam.

If you buy an Antelope Audio Zodiac you can use its volume control as a preamp as well. Plus, its a great sounding DAC with a lot of options for inputs and outputs. The Zodiac + has an analog input as well and is available used for $2000.

How about the bryston BDA1? I use one with my Mac mini and it sounds and works great and is the best sounding DAC I have used so far. I run from my mini via USB to a bel canto USB link then into a RCA input on the BDA1. There are plenty of inputs, I have my DVD player and satellite receiver hooked up to it as well.