Arsh,
3 thoughts for your consideration...
As a former Trivista DAC owner, I can say confidently that as ZD suggests your digital front end can be greatly improved upon at resonable cost. No area in audio has made such strides since the time of your gear. Computer audio, etc is another whole conversation, but a good dac will be a very noticeable improvement and doesn't have to cost you much at all.
Your overall question is tough to answer because you haven't told us what you feel your your rig is lacking or that you prefer in some other that you've heard. In other words, what do you hope an amp change will do sonically?
The pairing of amp and speaker is always critical and the speakers usually have the greatest overall impact on the final result. I have to go against the grain here and ask have you considered upgrading the speakers instead? Depending on what you seek, that might be the best way to get closer to your goal. Your amp will drive many speaker options, and there are plenty that will get you closer to your nirvana than the Sophias, regardless of personal preferences.
Also, your budget would help everyone zero in on more meaningful advice. Sure the Momentum sounded awesome when I heard it, but I don't think at $45k it would make sense to suggest in the context of your system. Cheers,
Spencer
