Location of bookmarking buttons -- irritability factor

Hi Guys,

I wanted to get a consensus where to put my social bookmarking buttons on the forum and also which ones to use.

1st -
Would it be less annoying to see them under the title or is a javascript 'sticky' bar at the bottom of the screen ok. I like the sticky bar (which stays in place as you scroll the page) as it encourages a like or a +1 click otherwise people will only see the buttons when reading the 1st post or 2.
WOuld that be acceptable or would you leave the forum right away as it would peeve you off too much ?

2nd - Which buttons to use
I have:
Facebook
Tweeter
Google +1
Digg
Stumble Upon

More or Less that that.

Thanks a ton for any advice in advance.

Yeah that's pretty much what I got I'm using a script based on JQuery which I'm modifying to my own needs. I'm not sure if I use these guys bar I'l be subject to spam galore and adverts.

I didn't see them mentioning adverts but stillreading on their site. Do you know what the 'catch' is with them ?

Thanks

great thanks for the info .... last question ... do you see any real benefit in going for their paid options ?

Quick feedbackon the toolbar, it does not support google +1 so i can't use it.

More suggestions welcome , please.