im wondering what the best healing druid weapon is.

Concievably the Golden Staff of the Sin'dorei or Hammer of Santification off Kil'jaeden.

Easy enough too get then .

I'd say the staff is better than the mace is most cases. Especially with three sockets.

Well aware, and that's what I'd go for, especially with all that spirit, but a lot of people will die hard to the Mainhand+OffHand combination.

how difficult would it be to get the staff?

Impossibly difficult. Kil'jaeden is supremely hard. Not to mention you'd need to invest a year or two with a guild to get priority on it.

o wow, and how about the hammer and if thats difficult as well whats a good healing weapon for a resto druid that you can get from a quest or some other somewhat easy means?

Laufing Man last time i checked your sig your druid was lvl 17 (or 27 im not sure), the weapons Sonic is suggesting are for lvl 70s and you shouldnt be worrying about them at all right now.
Youll get MANY staves/maces as drops or quest rewards as you go along, so just upgrade as you get better drops, focusing on one really good weapon and trying to get it would be irrational for you right now unless you want a twink.

Perhaps the fault of your post was asking for the best druid healing weapon; you should have specified for what level (or gear-progression level).

Ideally resto druid stats should include Spirit, Healing and Intellect. Scan the AH on occasion for them. Another useful mod is AtlasLoot Enhanced which allows you to browse through instance loot and find stuff that you might like.

o i did mean for level 70 because in mmorpgs i like to set goals cuz it makes the game more fun for me. =-D

Getting into a guild that could get you that staff is perhaps the loftiest of goals, and sadly the greatest difficulty is probably the social factor.