Which class d amp?

Hi,looking for advice on which amp to purhcase in this cateogry. Nuforce, Wyred4 Sound, Bel Canto or Spectron.

Can anyone help?

There are only three class D amp's I've come across yet that I'd consider truly up to par for two channel performance:

H2O Audio Signature 100
Spectron Musician III Mk2
Red Wine Audio Signature 30.2's (or 70.2's)

This is not to say that I have heard it all. There are probably other great products out there, but compared to the Channel Islands, Exodus, NuForce, Jeff Rowland, Bel Canto, etc.. the above three stand out particularly well to these ears.
I have heard, in chrono order over the years:
H2O 250 sig (early model - and it's the only one I haven't actually owned from this list).
Spectron M2
RedWine Sig 30
Nuforce Ref9 V2
Bel Canto S300
PS Audio A100
NHT Power2
Channel Islands D200

All have come and gone (but the H2O as it was never mine). Some lasted less than others, but the max was about 2 months. I'd put the CI D200 at the top. The H2O was good but it was a long time ago and I was less experienced then so I can't say for sure what I think of it.

Oh - I missed one - the Lyngdorf TDAI2200. I still own it (albeit it's been only 3 months) but I have stopped looking for amps, whereas it used to be that I'd be constantly on the prowl for a new amp. This is the most natural-sounding amp (well, it's more than an amp) and I NEVER find it compressing at loud volumes, or missing frequencies at low volumes, or sounding anything but 'just right' all the time. It reveals recordings quite well but not ruthlessly so; it does warm up the sound a *wee* bit. Just enough IMO.

For perspective: Have also owned a variety of budget to mid-level tube amps, mostly integrateds. No can do any more - if I ever went tubes again it would have to be on the high end, where I am given to understand they sound more like very good solid-state although I have not been privileged enough to hear any but the VTL Siegfrieds at a dealer demo once. Very nice but at $40K it better be.
I can second the Lyngdorf. Disclaimer I have an almost new one for sale at a rediculously low price. I found it competetive with the Ayre, Levinson amps I've owned in the past for a lot less $. At 200WPC it's not quite enough to drive my big hard to drive speakers. Seems like a high end bargain. Oh BTW the dealer locally also sells Nuforce and he says he prefers the Lyngdorf.
I have Nuforce 9 V2 SE which I like very much with a tubed preamp and VS VR 4 SR speakers. You are going to have to take all opinion with a grain of salt. This class amps have evolved so quickly that only comments about the latest models will represent the brand accurately. Also the amps are highly sensitive to vibration control, power cords and source, so these things will effect the opinions that you receive - but the newest renditions are worth checking out.