more on closing letters

[bricoleura.livejournal.com]

What's your opinion about signing a letter Твоя or Ваша?? There seems to be quite a regional difference, and i'd be interested to know your thoughts. My friends from Irkutsk think this is quite acceptable; whereas my friends from Syktyvkar think it's crazy and old-fashioned. Do any of you sign your letters like this? Because now i feel stupid for signing so many letters "ваша/твоя"

any other thoughts on regional differences, and also just plain personal differences?
One time, i answered "прекрасно" when someone asked how i was doing. in hindsight, i wondered if that was an acceptable, authentic answer, so i asked a friend and she told me NO!! no one would ever say that, if they did it would only be a joke. I asked someone else about my supposed blunder, and she said it was perfectly acceptable, and in fact she says прекрасно all the time when asked how she is doing! So, i guess this just goes to show how subjective language is...