website - using mambo/joomla or anything with a good CMS

I have a website that needs to be done in a fairly short time frame, so I will need someone that is willing to dedicate time and really put effort in making sure that all of our needs are met. We have experience with Mambo and would like to have someone that can develop something comparable to the quality of work we do. (not necesarily mambo) Mambo needs to have: forum, picture gallery and other modules. Specifics: We have a very specif look that we are looking for. Also, we need a manual to teach users how to use the website admin/users Our budget for this project is between 400-600US