Best dac from computer to tube amp ???? Weiss?


I am looking to upgrade my system again.
I have a Rega dac between a MAC mini computer and an Art Audio Carissa Signature 845 tubed amp with a volume control incorporated into it. I also have a Denon DVD-A1UDCI universal audio/video player that I am not using as much as I use the computer music. Speakers are Dali Helicon 800's.
The system sounds excellent now, but I am thinking that i might be able to improve it in the dac area.
I had a Weiss Minerva awhile ago which did not give me what I hoped for with the Jadis equipment that I owned at that time. I wish I could try one out with my current system just to see if it really performs the way people said it does.
I am open to suggestions on what seems to be working well in systems similar to mine.
128x128mattzack2