I would opt for something like a grower's champagne. The "usual suspects" are fine wines, but have prices that are out of whack. You can find some serious juice at the $50 price point and pick up a bunch of them instead of a single bottle of Krug. Here's an idea:

Jose Dhondt Blanc De Blanc
http://www.vestrywines.com/ProdDetail.aspx?id=WSPK0082