Warning! You have been bitten by the Burgundy bug.
French white Burgundies, such as the Chassagne Montrachet are expensive. The quality does vary between the producers and the vineyards and is, so far as I can tell, pretty unpredictable.
The vineyards are very small and production is controlled so the amount of wine made and thus available is small, and thus the price goes up.
But, these wines, when the are good, are great, and when they are great, they are superb.
Note that they are 100% Chardonnay, but taste (to me) totally different from Cali. Chards.