I second the vote for HAL 9000’s prequel trilogy edits, especially Episode II.
I’ve also heard of people doing Seciors’ Episode I, HAL’s Episode II, and l8wrtr’s Episode III for various reasons (it’s slightly closer to canon anyway since l8wrtr doesn’t keep Padme alive and I believe he also kept the Yoda/Sidious duel which HAL cut).
I also quite liked NFBism’s Canon Cut of Episode III, but it’s not 100% finished yet and he hasn’t been around lately from what I can tell. For that you’d have to PM him for a link to the workprint. He’s got a thread for it in the SW Fan Edits section of the forum.