I ordered a Plantronics audio 45 set from Amazon last week they were the best price at £25.99 including delivery. As always it pays to shop around. No doubt someone will find them cheaper and make my day.
If you think that's expensive I've seen it at a price that's 50 per cent more than Maplin..:-)
One forum member has already posted that he preferred using the USB phone version to the headset; it's probably because most people are used to holding a phone rather than speaking into a headset mike.
I got the Plantronics audio 45 set and have used them with Skype to call the USA and land lines here in the UK. Also use them to listen to music stored on PC. They work fine with no complaints, just take a few minutes to set the volume on the mic and that's it.