I play Minecraft since 2010 and so far, I've only used Soartex Fanver, Faithful and Traditional Beauty.
I think I don't have to explain Faithful, it's the default textures, but in better. Soartex Fanver gives a more calm and cool look to Minecraft, and doesn't go too far away from default. Traditional Beauty IS default, but with a bit more detail in the textures, I recommend that you test it right away here : http://www.minecraftforum.net/forums/map...er-600-000