Do you plan to use the packs in a car/truck as well, or just in the boat? If not, you'll find that the softcase packs fit MUCH better:
I have a bunch of the turnigy packs, they work great. You should be able to sell those packs (assuming they aren't damaged from plugging them into the ESC backwards) to someone with a car/truck for a good price. I know I would be willing to buy them depending on price.