Community Website with special features

I am looking for someone that can modify an existing community script (like myspace, dolphin, et cetera) with some serious additions. I want the site to revolve around an offline game (think basketball). Players would be able to login, setup teams with other players (so that they can play offline and interact on the site as either an individual or the member of of any number of teams), challenge other players/teams, setup games in advance including a referee (think event), be reminded of the event, report the results of the game, and have the system rank players and teams based on ability. I am not set on any rating system, it simply needs to be as valid as possible and reliable. I would then want the rankings to be able to be visible by geographic location and have the top x many players on the front page. If anybody thinks they can do this, let me know. I am looking for inexpensive, so the inclusion of any existing code is encouraged! This is especially true if you have this module or one very similar ready for implimentation. Thanks in advance for everyone's responses! I would expect the entire site to have integrated forums, chat, detailed administration capabilities, antifraud, good security, support of groups, photos, and any other key features that will enhance a community.