Cave wine.

Pere Ventura, Cava, Brut Nature, NV.

I'm into alternate sparkling wine only because I can't afford to drink Champagne everyday. Cava is cool though because its made the same way Champagne is made and frequently the same varieites, like Chardonnay and Pinot are used, though traditional varieties like Parallada, Xarel.lo and Macabeo can also be used (This isn't news to some of you out there.)

The Pere Ventura is crisp, clean, minerally and fairly neutral in terms of fruit. I'd also say that the moderate acidity serves as a good palate cleanser as you prepare for your afternoon Sherry. The Brut Nature means that it's drier than dry. Like gnawing on a bone. 

$14.99 at K&L.