Hi Buddy,
Social bookmarking is nowadays considered as a part of spamming & poor backlinks but however, it can add some juice to you tier 1 back links. If you are adjustable with you budget then go of senuke as it is fully automated and will give you full control on your backlinks profiles like you can choose the website you want, check the quality of spin content too. Only negative point is, its not cheap monthly wise. In case you are looking multiple options of lnikbuilding then you can afford it. Try it for a trial basis and check if you can manage it.
Good luck!
PS: I am not marketing for senuke its just a suggestions in respect to you post.
BR
BlueJunkies