If I had to spend money on software of this kind I would surely opt for Senuke
We have many clients and they have used all kind of softwares but at last they returned to us for quality ones.
So if you have budget than I will highly recommend that you should go for manual submission.
Simply pick those packages which are comfortable to you and have good websites.
The big benefits are:
automatic account creation and confirmation
multiple accounts and management
ping module to ping your bookmarks
you can add additional pligg sites
I do social bookmark manually.
I do it manually as well, but I gave SEnuke a try with their 1 month free trial and it seemed pretty useful if you run a marketing company. For people with only a couple sites, it's not worth the money.