Any suggestions for a good electricity useage monitor thingy?!

[IwishIwasmoreorganised]

DH would love one of these (he just doesn't know it yet!) but I've had a look around and they seem to vary in price massively so I'm not sure where to start really.
Any thoughts or recomendations would be greatfully received!

Bump.

No-body? Oh well, it was worth a try!

We've got an OWL. Bought it on the web. You fit it over the mains supply cable and it transmits continuous readings to the hand held display. You can set the £/unit and so see how the pennies are clocking up on your bill. I'm not sure I'll save enough to get my money back but they are quite fun if you are a control freak. The dcs like going round the house turning things off. It's useful to see if dh has left the iron on. Should be grateful because he's great at ironing...

Thanks for that - just off to find an OWL!