In Florida, heavy to extra heavy rods are the usual for pulling big bass out of heavy cover.

Fishing rod length depends on the certain bait you are throwing. If you are throwing a texas-rigged worm, a lighter, shorter rod is a good choice, such as a 7'3" medium action rod. For throwing a big, heavy swimbait, a 7'9" heavy action rod would be a good choice.
Rods come in a number of different actions, which means the flexibility and the stiffness of the rod. Actions vary from light to extra heavy. There really is a rod made for every technique possible.