Recommendations for a really good steam mop, please!

[FetchezLaVache]

Hi all, a couple of years ago you lot inspired me to try a steam mop and my DB kindly bought me a Bissell as a combined birthday/Christmas present. Anyway, I reckon it's now about buggered. It just makes that knocking sound and I get hardly any steam out of it any more. But I am a definite convert to the steam mop! So I was wondering if you could recommend a really good one, preferably cordless?

Thanks!