Heya. Lionheart I believe is a good fit for all of your requirements with the exception that we might be a little more on the casual side of semi-hardcore for your tastes. We care about clearing the content while it’s current, but that’s about it. We specifically aren’t overusing/abusing world buffs, for example. We also aren’t very pvp focused, although many members in the guild are interested in pvp. In any case I’ll link our recruitment thread below, and you can browse that for more information about us!
Or you can check out lionheart.guildtag.com for more info or to apply!
Thanks! 
P.S. Of the classes you mentioned, we have at least one space available for all of them except shadow priest!