I'm no hot-tub expert. We're actually in the shopping phases as well, but I do know that our local Jacuzzi dealer uses either a CoverMate I or a CoverMate III on their Jacuzzi's. They listed a CoverMate I in our quote for a J-485...
Looks like the CoverMate I takes the cover to the back, and then downwards slightly behind the tub (and requires more clearance). The CoverMate III just flips the cover up to the rear, so it's basically sitting "above" the top in the back, and requires far less clearance, but leaves the cover more "in view"...