The best one out there that I've used so far is an internet marketing consultant company called Online Search Solutions. You can view their website here:
www.onlinesearchsolutions.com.
They increased the sales by about double in a really short time online for us. And I know from other people they've worked with, that they have done the same for them.
They are a small company, and helped us in many different areas. And they're great to work with, because they really seem to care about their customers doing well.
They did work for us on our Affiliate Marketing, helped us completely re-design our website to be a better fit for our customers, put in analytics, started a google adwords campaign that stayed in our budget, did amazing Search Engine work that got us high rankings on Google in some really competitive words, social marketing, put ads up all over for us and got us links to a bunch of different websites (along with a lot of other things...). They are also good with price and really good with internet research.
I give them two thumbs up!
We have a makeup company, called Peacekeeper Cause-Metcis - that sells natural mineral makeup in Whole Foods and similar places, as a way to donate profits to fund women's health advocacy and urgent human rights issues.
Good luck with your project.
