Do you have a lot of experience with sherry? If not, which I assume, buy a few cheaper ones. Gonzales Byass, Tradicion etc. have lots of good (great) stuff in the 80 €/750 ml region (20-30 years aged). You could pick up a bottle of Gonzales Byass Matusalem (pedro ximenez/oloroso blend--pretty unique, I think) too.