If you don't wear a helmet then Alpkit Viper. I have one for running. Best budget headtorch around (Gamma is also good) although TBH there are so many other riders on the Dynamo that I did it with two of my normal commtuing lights (one ahead, one on road looking for potholes) and it was fine.
Will certainly be keen for the Dynamo, just need to invest in a head torch..