I have to get the champagne!

[Thomas]

There are a fair number of Champagnes to fit your description. What you will get here are the favorites of each individual who posts an answer, and you will likely get quite a variety of answers. The decision will be yours.

For dry and reasonably priced, I like Pol Roger (Brut).

For semi-dry, try Moet, White Star (Extra Dry) I don't like it, but I met many others who do.