About a year ago I too became a new 6.9 owner and faced exactly the same question. After a lot of hand-wringing and reading I ended up with those $780 replicas. No problems whatsoever thus far. I put Pirelli P600's on them (235/65-15's). Radius is the virtually identical to the OE tires. Ride, handling and looks were all immeasurably improved (though in fairness, the original 14" bundts had some kind of ridiculous Michelin snow tires on them).
See the pictures below. The top car has the new tires and wheels. Car color is different only because of lighting and camera, it's the same vehicle, top picture captures it much better. The bottom pic shows the tire(s) better.