Hey, check your pm's : )
I have to agree with the Elkmont suggestion if you dont need hookups. Especially if you can get a site that is streamside.
It depends also upon what you are planning to do while there. Most campgrounds in Pigeon Forge are not geared to tent campers. I would recommend the KOA in Townsend. It was called Little River. They have some nice tent sites and it's a beautiful area. You are right near the park and also a short 20 minute (traffic free) drive up to Pigeon Forge. Another campground I would recommend is the Great Smoky Jellystone. They have some nice tents sites and its a great campground. If you decide on the Cosby area, let me know and I can send you directions from there to Pigeon Forge going the traffic free backway.
I have been through most of the campgrounds in the area. I have pics of many of them. If you want to send me a pm, I will send you a link to my pics.