I'm nominating "Opt-In: Poetry - Rondeau". I think this one is a bit tricky - it's around the same length as a sonnet, but a lot of the lines repeat. I personally think that it's about as tricky/time-consuming to write as a sonnet since making repetition work is a little difficult, but I could also see the argument being made for two rondeaus counting as 1k since it does repeat a lot. I wanted to post this here in case other people had any input.