At this point when the OP is almost done shortlisting the DAC I guess I am not suppose to add a new product to the mix. That way, the W4S is a good product. They generally make good products. Their amps are also nice.
However if there is still a scope to add a new product to the mix, take a look at this:
UnitiQute | All-in-one Player | Uniti | UnitiQute | Naim Audio
You can probably buy it within GBP1k (including shipping) from:
Lintone Audio, Specialist hi-fi and home cinema - Naim Audio, B&W, Cyrus Audio, Arcam, dCS
They are running some offers these days and 24/96 version should be well within your reach.
This is not just a DAC but a package of DAC + integrated amplifier + network streamer. I have heard it in action couple of times now. You may not be in the market for an amp but:
1. This product has a "proper" Naim DAC inside. Till this day, after listening to various CDPs and DACs, Naim sounds closest to analog to my ears. This I am saying after listening to Naim CDP and a good TT side by side for the last 6 months at my home. So the DAC inside this product is a star.
2. The internal amp inside this unit is very good, possibly it may replace your exisitng amp unless you own something very very good already.
3. The network streaming ability of this device looked quite intriguing to me, works flawlessly and ripped files sound astonishingly good. I still believe a good CD transport is better but this device doesnt let me think that way while playing music.
These days even if someone asks me about a washing machine, I tend to recommend Naim:lol:
Honestly though, even though it is a all in one product, the performance is absolutely Naim class.