I would go with as short hitch extension as possible if you stay stock. In my case, I was able to go to 18" for my 9 1/2. If we are talking about 250-400 lb tongue weight for the heavy case, I don't think you'll need a Super Hitch.
However, if you are planning on spending $200 any way, you might be ahead to go with a Super Hitch to eliminate any possibility that you will "waste" money in the future. You could always look for a used parts to drive down the cost.
There was also a thread about extending trailer tongue length while back. That might be a possibility as well with an extended ball mount. It depends on how long of a Northern Lite you are looking at as well.