Which CMS for clan-like site?

Hello,

I'm creating a new website addressed to a niche community. This is my biggest project, so I'm a little confused. I have no idea which CMS will be the best option for me.

I'm considering three options - Drupal, WordPress with BuddyPress and a dedicated solution (if all else fails). It must be simple, fast, flexible and user-friendly solution, so all other suggestions are welcome.

Ok, let's have a look at functionality that I need:

0. Extended user profiles:
Nothing more advanced than standard Drupal instance, but including user's activity stream (i.e. XXX changed his avatar, XXX created a forum post, etc...).

1. Forums:
Nothing special. I only need possibility to create hidden categories.

2. Games library/catalog:
Classic game library - including informations about game, screenshots, rating stars, comments and "playing now/played" button (user can choose - all selected games are showed in his profile).
To all of games linked selected news and articles - staff must be able to choose it when creating a new content or adding a new game.
Is it possible to do in Drupal using books/taxonomy?

3. Games ranking:
A part of games library.
Displays a list of games added to the library, sorted by popularity or rating, with latest stat changes (decrease, increase, no changes).

4. Ranks/groups:
The same as in phpBB. User can join an open group or can be selected by group administrator to the closed one. Groups gives their members special permissions (like access to the hidden part of the forum or different nickname color) and are listed in user's profile and "Groups" subpage (with description and list of members). User must be able to be a member of more than one group.

5. Event calendar:
All upcoming releases and events categorized by tags. The same as in games library - all of them with linked selected news and articles - staff must be able to choose it when creating a new content or an event in the calendar.

6. Badges:
Members are able to get badges for some actions, i.e. rate 5 games. All badges are listed on user's profile and "Badges" subpage (with description and list of nominated members). It can be solved similar to ranks/groups.

Also:
- some of content must be able to be commented by guests and members, some - only for members,
- a chat - nothing special - just a chat for members only (not the IRC!).

So as you can see my vision is strongly based on user's account - this is the reason why I'm not sure to WordPress. With or without BuddyPress it's still blogging system.

Furthermore, in a few months, if my project gain some popularity, I want to expand it creating a network - thematic blogs on subdomains/other domains, social layer with central staff panel on general one.

I would be grateful for any suggestions.

Greetings,
Przemek