I'd recommend the Dolphin from Special Fins - probably with a medium blade to start with. It's not too expensive, very responsive and comfortable and you adjust the footpockets to fit if you need to.
I've used one for both Dynamic and CW and now have a carbon version. I have found it a lot easier to use than the Waterways I've tried and much more comfortable than the Specialfins monos with omer footpockets.
specialfins.com