As a word of caution, don’t let what you read change your personal aesthetics and convince you to buy something which doesn’t really resonate with you. No matter what I have read or heard, I just can’t get a personal appreciation of Jack Kirby’s work. And that includes reading his biography. I would not be happy later if I bought one of his pieces, or paid that kind of money for it. Also, don’t confuse pricing with quality. A lot of the higher pricing is driven by nostalgia, not just quality. Personally, I think that Tom Mandrake’s work on the Spectre is particular under-valued by the market, even though it checks off all the boxes I like to see in a piece. So, be careful what you read.