I am looking for ideas and help with my site www.spotcream.com

I want it to be sticky for young adults and parents

Im currently using wordpress for its seo capabilities but will consider an alternative.

What the site must be able to do.

1 i want it to have a review section where i can write a review about a product and then vistors can comment on there own personal reviews.(when registered).

2 i want the site capable of doing everything that wordpress can currently do if possible i want the changes made to be a plugin. It must also be 100% seo compatable.

3 I also want a members area where they can chat to each other and send internal mail(from admin i want to be able to mail them direct to there personal email adresses and add thing into the members area)

4 i want an article section for the site so articles related to spots and treatments can be posted.

5 i would like the ability to have an image gallery and a q and a section like yahoo answers.

6 i would like to have an inbuilt shopping system where visitors can buy products i also want the ability to allow selected users to sell there own products but they will not handle the cash admin does and they get paid a percentage,

7 i would like the ability for visitors to submit you tube videos so a section of the site for them to be submitted.

8 i would like the ability for the users to sign in via social ids so fb yahoo etc.

9 Any ideas you have to develop the site further would be appreciated.

I am trying to achieve a user friendly social site for teens and parents suffering from acne so they can get advice and products to combat the specific problems.

Please if your serious about this enter the text spot345 when replying to show you have read what is required.