If money is no object then it only depends on how much I really want said piece.

Well if money was literally no object then the price shouldn’t matter.

But if I’m honest and realize that that money could be spend on other things (like helping people), I’m certain that I would rather do that with my money and enjoy seeing art at the museum instead of hording it and then having to protect it from thieves. I would probably be willing to buy art in the 4 digits for my home/office/etc., and maybe commission some cool pieces in the 6 digits (e.g. modern re-imaginations of mechanical sculptures by Heron of Alexandria).

I would spend all of it on art and keep just 130 billion for incidentals.

If money was no object I’d have all of Mucha’s original works.

^^ Have some art to Google. :)

What?

I would not pay outrageous sums for paintings. There is, however a man doing a new sort of painting and I would like to have one. He uses bubble wrap, hanging it from a wire, and he fills each bubble with paint using a hypodermic needle.
They look really cool.

Otherwise, if I were going to buy art, it would be sculptures.
I don’t have any particular works in mind at the moment, but I think 5M would be my stopping point, per each.