Apparently the KTS ones start at £39, and give a "marked improvement in depth and sustain, as well as a more pronounced individual string clarity and a more focused response".
I'm thinking of whacking one on my Gibbo - from the sounds of it I can't go wrong for £40 quid!
EDIT: I stand corrected, you're looking at £60-70 as you said. Still, like 5F says, a ton of people shell out £70 on new pickups or pedals to improve their tone, seems just as sensible to upgrade what is essentially one of the main components of your guitar's tone!