SEO Experts

I’m looking for a SEO company to make organic SEO for my personal website on the major search engines (Goggle, Yahoo, MSN). The site is photography related, well established and already indexed on many search engines, including google, yahoo and msn. We would like it to be in the Top 10 position for highly competitive keywords, including “Nude Photography”. The site is currently PR4 and was on #2 spot on msn for “Nude Photography” for over a month, but then totally disappeared. At present time it is on Yahoo page 2 for “Nude Photography” which drives reasonably nice traffic, however I have never ranked this high on Google. Top Google results for this keyword are PR6 websites and the rest of top 10 are PR5. I aim for highly competitive keywords/keyword phrases with “Nude Photography” being my goal. I know this site is capable of it and with right directions of SEO experts this shouldn’t be a difficult task. Site is already established and indexed. I’m not looking for directory submitters – I’m already listed in most good directories, including DMOZ, however I am open to and would consider different SEO options so as to achieve the result. You must have experience with SEO (natural site optimization) on major search engine listings (Google, Yahoo and MSN). You will need to provide PROOF of your RESULTS and sites you've done in the past. Otherwise I will not consider you. You must not – under any circumstances – consider any black hat techniques. I’m looking for experts who can deliver results with 6 months well directed SEO. Because there are way too many scam artists, I will only pay you when results have been delivered (meaning after my site is on top position for Nude Photography on 3 major search engines). If you have a seriously good reputation I will consider small monthly payments for your monthly efforts – however, if you can’t achieve required results, please do not waste my time, because you will also waste yours – you will simply not get paid, unless you deliver results. I will consider using your services even after the goal was achieved to retain my top position – provided you have provided exceptional service and proved yourself well. Time wasters – do me a favor and don’t bid.