I've been using the GS-761-H model Okuma for the Huddleston and have been pleased with it. The extra heavy one would work too, but it's kind of overkill. You could throw 12" Slammer on either rod since they are both really stiff.

Both the Okuma rods are much stiffer than the Diawa Heartland, especially in the tip section. If you had the Diawa and the Okuma you'd have pretty good coverage for light stuff and heavy stuff respectively.

Swimbaits are just another fishin lure. A guy who is serious about worm fishing might have 5 worm rods. Same is true for a guy who's a swimbait guy. If you're into a technique you'll start to see all these situations that need slightly different tackle and then the rods start piling up :)