I like both the tank cars and gons, even though I think the old MDC now Athearn gons never looked "substantial enough" as Mil gons.
I am adding a refinery to my layout, and need tankers. I was lucky to be in Milwaukee earlier this year, where Hiawatha Hobbies has lots of stock from older runs. I picked up several three packs for $66-72 per set, about 2/3 of that MSRP, but presumably about 15% below the typical LHS price. I guess I am getting to that "bubble gum used to cost a nickel" age, LOL. That said, when assembling a fleet (I am anticipating a big refinery) every dollar saved help.