A mini Wiki website

I need to buid a website that is similar to a Wiki and has following functions: 1. Registered users can create entries according to preset format (including a terminology and its definition) 2. The contributed entries will be stored in a database; 3. Other registered users of the website can browse entries in the database, or search for the entries using key words; 4. After getting the search results, the user can select and save the favorite entries under his/her account. 5. The user can generate a summary report with all the selected entries. 6. The user can generate a formated report in a pdf format or export it as a text file. 7. Each user will also be ranked on the uniqueness and importance of entries contributed and the number of times the entries are selected by other users. Other requirements: This is a brand-new site. I need full design done, with graphics, including a new logo. In terms of style, I want a very professional look with bright colors that will appeal to my clients who are typically young professionals. It also needs to be very simple and easy to use. Specific expertise that I am seeking: Experience on website design, programing, and database is essential. No specific requirment on programing language, OS, and database system. Experience with prompting website through search engines is a plus. Timeframe for delivery: I need to have this up and running with 45 days