Lateral thinking, but how about a Mac Mini feeding the XPd? About half the price of the X2, maybe a bit more if you get Pure Music or Amarra on it as well. Or go for a dedicated Windows machine (to save any anti-Apple comments)
I use a dedicated Mac Mini / Pure into an Arcam rDac (and then Ayre AX7e and Harbeth 7/2's). I haven't tried a dedicated streamer so don't know how it would compare sound quality wise. But I do know the front end beats the Meridian 508 that I used to use, which itself was no slouch.
How about WHF do a shootout between dedicated streamers and the PC/Dac option? After all the streamer is essentially a computer with the extraneous bits stripped out; how much of a difference does it really make? I suspect not much, if any at all, but the truth would be in listening. I've suggested this before and had a few people agreeing; are the hi-fi manufacturers confident enough in the superiority of streamers to submit to the test?! And who mentioned advertising revenues (waits for clip round the ear from moderator:roll: )