A friend has asked me to build a site with the following options:

• staff members must be able to add new music and artists to the page
• a gallery must be provided - it is also good if each artist has the ability to have his/her own, smaller, gallery
• users must be able to vote for artists
• users must be able to alter in discussions (forums or comments sections)
• staff members must be able to blog
• staff members must be able to write articles

I did a small project where i actually implementet all of these features, but i want to use an existing content managment system for all of these features so that future devolpers can, hopefully, more easy extend the website. And also, so that i dont have to provide to much documentation.

I have never developed a website using an external cms like drupal or wordpress and after seeing hours of tutorial videos of both systems, i still cant make up my mind on wheter i should :

a) use Drupal 7 b) use Wordpress 3 c) create my own cms

I can only imagine that staff members would also want to create content using iphone or android based mobile devices. But this is not a required feature.

Can someone, with experience, please tell me about their experiences with bigger projects like this?

The site will approx. have a total of 400 000 - 500 000 visitors (not daily visitors, based on numbers from last year in a period of 4 months)