I bought a Cateye Stadium on Ebay and its brilliant!!!! This light gets repect!!!!!!!!!!!! I use it for comuting in Sydney traffic at night when I pick the wife up on the tandem to ride home. Everyone sees me. When I pull up behind cars at traffic lights, the drivers will reach up to adjust thier rear view mirrors to avoid being blinded. Its not cheap but it's definately money well spent.
I finaly ended up ordering a Smart led light set which cost under £20 (www.ribblecycles.co.uk/details.asp?D=P&Cat=LIGHTS&Section=LIGH&GenCode=SMARLIGH0900) with p&p. Cheapest place i could find was this link. I will get the lights in about a week when i get back from spain and tell you whether they are any good or not in case anybody is looking for this type of light.