Fly rods designed for this type of saltwater fishing require a stiff, fast action that can pull up a fast sinking line with ease and have a heavy backbone for lifting power. I get asked a lot about "overlining" a rod. I usually recommend it because it allows the caster to feel the rod load and helps with the timing of the cast. It is especially effective for intermediate level casters where timing is a challenge.
Many manufacturers offer great technology, especially at the high end. Winston uses Boron; Sage has introduced Konnetic Technology, Hardy has Sintrex Technology, and GLoomis has the NRX. All this new technology allows anglers to apply maximum pressure to a fish and still have a lightweight rod in their hand. The investment into a good rod is something that is well worth its weight in fish and is just plain pleasurable to cast. The new developments in rod technology have also spawned a new field of moderately priced rods that are also high performance.