Splurge doesn't even begin to describe a meal at Les Crayères. A la carte, the most affordable starters are around the €50 mark and the full tasting menu with matching champagnes is €305. And you'll reel when you see the wine list and the astounding champagne cellar on offer. However, there is a way to enjoy the exquisite food and pitch-perfect service for less: the business lunch (served Wednesday, Thursday and Friday) is a three-course extravaganza, and a relative steal at only €70 a head. Add a couple of glasses of champagne form the cart they wheel to your table (we sampled a number of vintages that are no longer available, even at the houses that produced them, and there were several between €12-20).
So it's not cheap my any measure, but it's worth it. The menu changes regularly, but currently offers foie gras, scallops or oysters to start; then sea bream, salmon or quail; and finally vanilla, mandarine, or chocolate-cherry desserts. Check out the website for details. Add to that a dazzling array of amuse-bouche and other surprises along the way, service that is personal and attentive but not invasive, all in a beautiful room, in a lovely château, with gorgeous grounds. 
When we realized that our lingering lunch was going to cut into our champagne tours later that afternoon, they slipped away, made a few phone calls, re-arranged our schedule and booked new tours for us so we could enjoy the end of our meal in peace. 
If you think you deserve a treat, don't hesitate. This is what you need. Of course if you can really break the bank, you can even stay in the hotel in the château.