1- Bridi Trainers T20, T40, original Kaos. Agree with Cafeen Man, those kits were marvelous. My first one was the T20. I would love to see those kits available again, but proabbly with some re-engineering to make them lighter.
2- MK Arrow. It was supposed to be my F3A entry, but I came late.... I am still looking, thou.[
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3- OK Models Pilot kits. I remember having a Quick Built Series Trainer 15, put the fuse together over the table, take a look, dismantled it and put it in the box again. It was incredible.