Seeking suggestions - What would you buy?

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This may or may not work....Im trying to convince myself to plunk a little money down on a card that will spruce up my collection. I have a short list of cards that I might target, but Im also thinking about the "what abouts" - an interesting card that I just havent considered lately. So, with that said, what card(s) would you buy or suggest buying at these various levels:

$100
$200
$500
$1000
$5000 and up

Im intentionally leaving this open-ended to keep the ideas flowing. Feel free to be as specific ("this T206 Nap Lajoie") or general ("an E91 card") as you would like.

Thanks for your input!