hI,
LinkVana - $147 per month is too expensive.
I tried some others cheapers but with bad experience.BIG g ANNIHILATOR limits
3 keywords for anchor text
For me the best is Neurolinker.com where you can you can enter up to 100 websites and they boast over more than 2.000 websites in their network .
You can post quite infinite number of anchor keywords.
You can put your article on websites in their
network of sites and and have link back to you.
Visit them to get more infos (they have a bookmarking system and more interesting features.Linking building is slow but accurate as you have hability to refuse non desirable links.
Actually cost is about $27 per monnth.
hope this helps.
Regards http://www.warriorforum.com/images/icons/icon3.gif

Have you tried automaticbacklinks.com?