Hey Charlie
Better brush up on your bassin' skills. Gonna need them in a couple months.
I've used a couple different brands of dive fins for float tubing. I always had serious problems with leg cramps while kicking around. I'd say, 5 out of 6 trips, i'd have some issues with my calf, or hamstrings cramping up to the point of having to stop, stretch, and rest. I bought a pair of Force Fins, about 3-4 years ago, and cramps are not an issue anymore. I'm not sure which fins are faster, but I feel the Force Fins are easier to kick.
For me, the cost difference is not an issue. It's all about being pain free.
brians