Bells Black Note is so good. In Jersey I find that Ten Fidy is easily obtainable and very balanced as well. Probably my go to stout.
Old Rasputin... Clown shoes makes some killer stouts, vampire slayer and blaecorn unidragon... Both are 4.75/5 in my book
Some of these suggestions are ridiculous for being balanced. I suggest Obsidian Stout and Founders Porter based on the OP. And if you cross into the imperial zone, which is mentioned a lot in the post, I'd second Dark Horse Plead the 5th edit: While typing, someone suggested Velvet Merlin, one I'd forgotten about but which is also an excellent suggestion
Personally, I like the obsidian stout and the Alaskan stout. I really got into both of these when I was stationed in anchorage. Since I've been back to the west coast, I like the ninkasi Outis stout and was glad to get my Alaskan again. Haven't had obsidian yet.
Deschutes obsidian, Anderson Valley and Samuel Smith oatmeal stouts are all well balanced. Any of the yetis are good for IRS.
Founders Breakfast Stout is IMO one of the greatest, attainable stouts out there. I feel it kicks the pants off of Founders Imperial and others. Yes there are a few stouts that are better and also some hype train stouts but this is my go to stout.
I'm not sure I would consider Ten Fidy or Yeti a good balance although those are 2 of my favs. I also wouldn't recommend either of those as an all night beer because of how much body those stouts have. If I were having someone try a stout with less body and still an imperial, I would probably have to go with something like Stoudts Fat Dog. It doesn't have the thickness of Ten Fidy and Yeti and the fumes are less noticeable when drinking (neither of which matter to me personally). All Nighters (my opinion) - Left Hand Milk Stout/Nitro, Terrapin Moo Hoo, Anderson Valley Oatmeal, Stoudts Fat Dog, Bells Kalamazoo, Magic Hat Heart of Darkness, just to name a few. Non All Nighters - Ten Fidy, Great Divide Yeti, Bells Expedition. Sam Adams Imperial Stout is another good one that I think has a good balance.