In the Eastern part of the Loire Valley, just West of the city of Bourges, where one of the most beautiful cathedrals of France must abolutely be visited, you should consider besides the better-known Sancerre and Pouilly, the very fragrant and delicate whites from Reuilly (Claude lafond) and Quincy (Jacques Rouzé), also made rom Sauvignon Blanc. And make a stop North of Bourges in the small village of Menetou-Salon where a few producers offer not only very dry but aromatic Sauvignon Blancs, but also great fruity reds made exclusively from Pinot noir. Some good producers: Jean-marc Roger, Domaine de Chatenoy, and Henri Pellé, .
In the Chinon area a visit to the fabulous Couly-Dutheil is a must not only from their Chenin Blanc based whites, but also for a truly spectacular Rosé made from Cabernet Franc.
Speaking of chenin Blanc, if you would like a sweet but totally original white, do not miss the at the same time very mineral and slightly pungent wines from Savennnières in the Anjou area (a Domaine de Baumard would be a good choice). Try and locate local appelations such as Coulée de Serrant and Roche aux Moines. Also from the same area, near the very pleasant Côteaux du Layon
(Chateau de la Genaiserie is a safe choice in C du L ) , and still made from Chenin Blanc, you`ve got to secure a bottle of Quarts de Chaume, I also would suggest a Domaine de Baumard.
And if you stop around Saumur, try the Cabernet-Franc from Saumur-Champigny. Delicious and lively reds that age pretty well.