DAC OR AMP? Your thoughts POWER vs CLARITY?


Ok gents, here is my dilemma. I have:

NAD 673
MIT AVT1 Cables
Cambridge Audio DV79 DVD/CD
PMC TB2 and center speakers

Which direction would make a larger difference. I was thinking about a Benchmark DAC1, but some say power is more important. In that case I would get a Bryston 3B. This would be for 2 channel music mainly. Thanks!!!!!!
rkerv
I can't find any current or past NAD product called the "673" on the NAD website.

What do you find lacking in your system? Do you feel like it's underpowered?

Also, what is your budget for an upgrade?