Processor DACs

First of all, I too am considering the purchase of the Anedio U2 for use in my PC-based 2 channel system, so I need to tag this thread. Second of all, the advantages of an outboard DAC over the DACs in a processor include the following:
Better output stage
Better power regulation
Better shielding from RFI and ground loop hum
I should note these comments are specific to 2-channel music. I run two systems, one Denon-based HT system, and one component system for 2-channel music only. My 2-channel setup mops the floor with the HT system when playing redbook audio. Another big difference is the pre-amp and volume pot in a component system, HT processors cannot compete with these IMHO, but YMMV etc.

Mateored, you may have reached the flatter part of the cost-vs-improvement curve.
Maybe the only comparison between Wadia/Anthem DACs you can make is in true 2-channel mode; turn off your sub and your surrounds, and make sure the two fronts are crossed over below the bottom end of their frequency response.
Another possibility is to purchase a 2-channel pre-amp that also has bass management in the analog domain. Anthem has a great pre-amp that does this, the TLP-1, but this option adds another unit in the signal path and really wouldn't be an apples-to-apples comparison of DACs...unless you used a line-level analog connection from your receiver into the TLP-1...

I chose a long time ago to build a separate system for 2-channel. I have a Denon AVR and B&W 6 series speakers in the home theater system, and although I really need a 5-channel amp to finish it out, I'm not spending any more money on it until I am completely satisfied with my 2-channel system in the basement.
This is not a great option for everyone of course, because not everyone has a spare room for dedicated 2-channel. But most of the +/- $1000 pre-amps out there will best the pre-amp section in an AVR of the same or even slightly higher price point. This is definitely true in my case. And I almost bought an Onkyo, but found a great deal on a Denon at the last moment.

After much research trying to fix my own issues in my basement office's 2-channel setup, I recommend a DAC or a USB-SPDIF converter that has a specific clock for 44.1 kHz music (anything ripped from normal CDs). All of my music is Redbook. Most DACs/converters out there only have one clock, and that clock upsamples 44.1kHz music to 48kHz. This is called "clock synthesis," and obviously the math will produce rounding errors. The DACs and converters out there with 44.1 kHz clocks will brag about it, because very few pieces of gear have two clocks. The Schiit Bifrost's USB board has two clocks, the Anedio U2 converter and D2 DAC have two clocks, the Audiophilleo 2 has two clocks. Those are the cheapest ones I have seen that specifically say there is a clock meant to handle 44.1kHz data, and another clock to handle 48kHz data. april Music's Stello U3 is another converter that might have two clocks, cannot remember. If you are going from a laptop, a USB-SPDIF converter like this will improve your sound.
And Hifiguy5, if you buy a WFS DAC 2, skip your processor altogether and go right into an outboard amp. The DAC 2 has volume control. At least consider that as an upgrade path Maybe the processor you are looking for has inputs that go right to the amp section, bypassing the processor's volume pot?