JohnDuncan:I'd start with the Logitech Transporter and Linn Sneaky DS at that money (ignore the fact that the Linn has built in amps and just use it as a player).
Higher than that and there are a few more Linn DS players - Majik, Klimax, Akurate - just depends on how far you want to go (12 grand in the case of the Klimax, I think). The NaimUniti and HDX are also worth a look, though offer more than you ask for here.
Other than that, not sure - intuitively I think I'd find it difficult to spend even a grand, when a humble Airport Express and then Apple TV have given me such good results...
Thank you all for your advice. The Logitech Transporter and Linn Sneaky DS are good options. However, both have a DAC built in - which I don't need - and the latter has amplification as well. As you say, I don't have to use these features but it's a bit of a waist, particularly in when considering the Transporter.
I don't think the Linn and Naim solutions would suite my setup. I already have the amplification and DAC and I like it a lot.
Apple TV might be an option although I don't like Apple very much. Are you aware of any reviews in relation the quality of the Apple TV digital audio output stage?
Any further thoughts in light of the above would be realy appreciated