SEO expert services required

I am about a week away from going live with my online payment /merchant services provider. We will serve all markets but will specialise in high risk sector, with the SP of faster payment turnaround than the market standard. What I want to achieve is a review of our current website and a working relationship with someone who can help improve CONVERTING traffic to our site while not making us fall foul of penguin etc etc. If you can help, get in touch.