You should check some of the previous TacT posts--there's lots of good information in them. In one case I remember someone did a well-conrolled A/B comparison with some dCs gear(I think) and the TacT held its own, much to the surprise of the owner. Why not give it a try and see how it works in your system? Heck, even if you find you want another DAC you'll still reap the considerable benefits of room correction, which will probably make a much bigger difference in the overall sound of your system than the DAC anyway. Best of luck.
p.s. Jcb2000, did you do direct A/B comparisons between the DACs you mentioned, or are you going from memory? Just curious--would be interesting to know where the differences lie.