Colin, Having built two Foreplays -- one from a kit, the other a clone -- I'm a fan of Doc B. However, his new SEX amp outputs about 2W, so you've got to be real careful about what speakers you mate it with. Doc's suggestion to use it to drive a pair of computer speakers (i.e., very, very nearfield listening) looks intriguing.
What speakers are you going to be mating your SEX with (if you don't mind me getting personal)?