Hello Omid
I must thank you so much for your detailed answer.
I won't reply to your post point by point, however the main point that I will raise is this....
NOTE: seomoz and OSE crawlers and other third party systems generally are not equal to google and while i can personally assure you from experience that you are safe with the big G, I can tell you that you will get crippled reporting and analysis delivered by seomoz and OSE due to the wix SEO approach. so if you need solid reporting, wix may really be a bad option, unless you can create your own custom reports using various sources of info, including what is available from seomoz.
I find with WIX I cannot track/analyse my site i.e. Google Goals, Analytics etc. Therefore it has left me with no other alternative but to re-construct our website using traditional code through Dreamweaver.
Just out of curiosity, does your company handle SEO? Do you also have your companies URL address?