(Reuters) - If you can't afford a top bottle of Grand Cru from Bordeaux, you might be delighted to learn that most leading chateaux also make less expensive "second wines". In the quest for quality, Bordeaux vintners such as Chateau Lafite-Rothschild, Chateau Latour and many other famous names have become more selective in order to obtain a signature taste and avoid vast differences between various vintages. Bordeaux wines are blended wines and a vintner composes a vintage by using various grape varieties in changing proportions and increasingly keeps the juice from specific parcels apart up to the mixing stage. There is also a difference in age of the barrels used for ageing. New oak leaves a different imprint on the wine than older wood.