Hi Joe, I own a pair of Cressi's and my wife has a pair of OMER Ice fins. They are both extremely comfortable, but I would recommend that you look at the OMER fins. The main reason is that the blades are interchangeable on the OMER fins, whereas the Cressi blades are bonded to the foot pockets permanently. Once you've had some time in your new fins, you might find that the Cressi's are a little soft....but that depends on your physiology and how much you get into freediving. The OMER Milleniums are comparable in price to the Cressi's, and you will get the option to upgrade into stiffer, more performance oriented blades in the future.
Or you could jump right into a pair of Sporasub Carbon Radicals, which are very powerful and also comfortable.
Good luck,
Erik Y.