For a simple, no frills but easy to get working fuzz I'd suggest the Sandspur, with the proviso that you might need to add a small cap to the second transistor to tame weird noises. For an amazing OD/fuzz which is based on a Fuzzface Chuck is right - the Skreddy Screwdriver is fantastic. And for a Strat player the Skreddy Lunar Module - or Fuzz Aldrin here (similar to the Screwdriver) is a wonderful pedal too. Skreddy stuff is amazing.