Techna is widely regarded as the best but the wait is like 7 months from the states. They are available here occasionally 2nd hand. Which style depends on your own preference. I have a razor but the scythe is nice too.
The new CP Swoop is actually the same weight as the Techna, even though it's aluminum, so I would think it would work just as well. i.e. you can remove the return spring and not worry about bounce.