They are priced slightly differently. Apart from that, I think they are all pretty good (certainly good enough for a DD bike). I think in order of Cost, Wavy are cheapest at around 150ish including VAT. The Galfer/Braking ones are around the 180-190 mark including VAT. Not sure if anyone has them any cheaper.
These Armstrong Wavy ones seem to be about the best deal I could find:
http://www.jesterstrickbits.co.uk/pr...i-Monster.html