You need a customized php CMS for your requirement you can contact me after checking its features
We designed and developed a CMS called "Ray CMS"whose features are
a. Multilingual (9 languages support)
b. XHTML validated
c. Cross browser/Multi browser(IE,Firefox,Netscapte,Opera,Safari)
d. Ready made templates (6-9 templates)
e. Complete form builder
f. Very rich GUI editors
g. Module Integration
h. Gallery management system
i. User management system
j. News/Newsletter management system
k. RSS Modules
l. Each page rank/rate module
m. Social bookmarking system up to 10 services

If you are interested in it then reply me at manzour[at]buraq-technologies[dot]com