[Hampshire] Recommendations sought

Hullo Everybody,

I am after a USB dongle 'g' wifi card that will play nice with Ubuntu,
and was wondering if anyone out there is using one they could recommend,
or knows of a site that might point me toward a good one?

I have a PCI slot but it will require the additional purchase of a riser
to side-mount the card in the slimline case, hence the USB requirement.

Sean