For the moment I use a rather inexpensive Dac, the TEAC UD-H01 which I bought for 335€. It has all the latest technology: 192/24 async USB as well as coax and optical inputs and RCA + XLR outputs.
I have been using a lot more expensive Dacs before and bought this because I am in-between Dacs for the moment but I can tell you this little thing sure doesn't sound bad.
The headphone output on it is not bad but nothing special either, an external amp would do your W3000ANVs more justice.
For amps the least expensive amp I tried the W3000ANVs with was the Yamamoto HA-02 which costs 88000 JPY without shipping and PayPal. That's a really good amp for it's price performed just as good with my AT headphones as it did with the HD800s.
I have been using a lot more expensive Dacs before and bought this because I am in-between Dacs for the moment but I can tell you this little thing sure doesn't sound bad.
The headphone output on it is not bad but nothing special either, an external amp would do your W3000ANVs more justice.
For amps the least expensive amp I tried the W3000ANVs with was the Yamamoto HA-02 which costs 88000 JPY without shipping and PayPal. That's a really good amp for it's price performed just as good with my AT headphones as it did with the HD800s.