Difficult to say, prices have skyrocket... . But i have Borges 1720 Pather and 1780 Boal, 12 Barbeito 1795 T and 3 CVM 1795 T, 3 Oscar 1802 T ... And also many other Terrantez..
I've a bottle of 1862 Borges Terrantez and one of the 1802 Acciaioly Terrantez. These are the two best Madieras I've had.
Of wines not tasted yet, a bottle of 1810 Borges Sercial.
Right now, any bottle of Madeira is prized... Have a few bottles of 1940's Madeira that is nothing special. Have 1968 D'Oliveiras and few others sitting at a B&M ready for me to pick up...
Well, I should mention all my mentioned bottles were bought 12-15 years ago. Most Barbeito 1795 cost $ 900 ( dollar rate that time ), and note including 25% Norwegian VAT at our State Monopoly .
They have little markup as winesbops around the world. They only have a percentage on the price they pay the supplier. Not markup on the value on the free marked.
I do have a an ancient bottle, but I know little about it; and while it might be 'worth' more on the open market than my other bottles, it's a bit of a mystery as to what it will taste like! So "prized" is probably not appropriate for it.
I used to own a 1715 JCA, but someone offered me something I couldn't refuse AT THE TIME. Sigh. I should've kept a picture of that bottle to keep in my wallet......