Need experienced web designer/SEO specialist for Real Estate Website

I own a real estate investment company and need a new website.

We buy, lease, and sell properties. These are the three goals of the website.

To buy, the site needs to generate leads - create contact from motivated sellers via online forms, email, telephone etc.

To lease and sell, the site needs to be built in a way where we can EASILY upload/change pictures, video, and property data on a continuous basis.

It needs to project a very professional theme and be well optimized for SEO.

From research, it appears Wordpress may be a customizable, easy, user friendly option. I've seen a number of templates that can be purchased that appear to do what I need. But, I have also been warned templates can be quite limited and lack flexibility to grow the site in the future. True?

I've purchased a domain and have hosting at Bluehost. They offer a number of free wysiwig builders (pagewizard, concrete5), along with Wordpress, Joomla, Drupal, etc. via simple scripts.

So, basically I have lots of questions:

Which platform is best for a real estate website?
Which is easiest for ongoing maintenance and uploading/changing properties?
Which is best for SEO?
Which is most scalable/changeable if needed?
I've also looked at purchasing coffee cup or web easy professional. How do they compare?

I am looking to have the site built, but also want someone who can train me at times. Someone who speaks great English and can work with me over the phone. I've tried a few projects via guru and elance. Tired of working through language and time barriers.

Obviously, I am looking for someone who is experienced, works fast, and is reliable. We are running a business, and as they say....time is money.

Any ideas or recommendations are GREATLY appreciated!!