Hi All,
Cooking with wine? The truth is that many classic dishes in the French repetoire include the use of wine or fortified wines and liquers. For example, if one looked at the works od that great doyenne of cooking - Julia Child, you will find recipes using white wine, red wine, brandy, sherry, Noilly Prat, Champagne, beer, lager, cider, Calvados and Armagnac etc..
The reason for using any alcohol in any dish is predicated/based on 2 reasons. The first is the flavour which the alcohol gives to the dish and the second is that it is tradtional.
Consequently, regarding the choice - buy the best that YOU can afford and second, use the wine or alcohol appropriate, relevant and integral to the dish.
If you choose not to use an alcohol for whatever reason(s), my advice to you would be to contact this messageboard for advice for an alternative. For example, in a Carbonnade de Boeuf, it may be that you need to cook the onions really well and add a good dash or 2 or 3 of Worcestershire sauce to get that depth of flavour. What you need is the note of a bass not a tenor - you get this with the beer/ale/lager. However, in the absence of this you may need the Worcestershire sauce or a dash of Balsamic vinegar - red or white.
Hope this helps,
Archiduc