I agree with Sfar, the original V-DAcs come up for sale often used. Should be able to puchase one for ~$150 They have USB and a coax input so could be used for both computer and CD sources.
The PS Audio Digital Line IIIs also go on sale here often. One could be had for ~$350. Significantly better than the V-Dac. A true piece of audio. I am currently using one.
I purchased a Pro-Ject USB box here for $100 18 months ago. Use it to feed a headphone amp. Much better than out the headphone output. It is USB only.
All depends on your budget. Most any external DAC would be a significant upgrade to the headphone ouput. If you buy used your upgrade path becomes less expensive.
Enjoy your new system!
The PS Audio Digital Line IIIs also go on sale here often. One could be had for ~$350. Significantly better than the V-Dac. A true piece of audio. I am currently using one.
I purchased a Pro-Ject USB box here for $100 18 months ago. Use it to feed a headphone amp. Much better than out the headphone output. It is USB only.
All depends on your budget. Most any external DAC would be a significant upgrade to the headphone ouput. If you buy used your upgrade path becomes less expensive.
Enjoy your new system!