Need a quiet, small PSU. Which one?

I've also got a TV tuner, floppy disk drive and card reader attached also. Doubt it'd make too much difference to the power required but thought I'd mention it.

No worries. Well it's a Jeantech Media Cube. There is a link to it here: http://www.eclipsecomputers.com/pr [...] M218&af=50

Okay! The case is advertised as suitable for home theater use.

In the second link you provided the web page has a link to power supplies suitable for the case. Did you take a look at that? Dimensions are given for each psu:

http://jeantech.com/power.htm

I am not familiar with the jeantech power supplies so I cannot make a recommendation. Perhaps someone in your part of the world would be able to advise you.

When I looked at the jeantech power supplies I noticed that some of them appeared to be standard atx power supplies. Generally speaking the recommendations are usually for Corsair, PC Power & Cooling, Seasonic, Antec Earthwatts series, and several others. Technical reviews can be found at jonnyguru.com

Here's a link to a web site with technical reviews that include quiet power supplies:

http://www.silentpcreview.com/section10.html

Look around the web site. You might find something interesting.

With onboards graphics you would not need much power. However, you did mention the possibility of adding a graphics card later. The general rule of thumb is that a high quality 500 to 550 watt power supply with sufficient current (amps) on the twelve volt rail(s) can easily handle ant single video card made.

Corsair, PC Power & Cooling, and Seasonic are brands with a reputation for high quality power supplies. They consistently earn high marks in technical reviews. if you are on a tight budget, then the Antec Earthwatt series would be a good alternative.