I am one of the administrators for a medium sized community of gamming and we are currently looking for a CMS to base our new site upon. We are currently investigating several portal systems and i have a few questions about Drupal, i hope there is someone here who is able to awnser my questions.

Background:
We are a medium sixed gamming community that are currently focused on 2 games (Battlefield & World of Warcraft). We currently have one site for the BF part (home coded) and a common forum that both parts use. We now want to integrate the two parts into one common portal system to manage the entire community. The most importatnt part of the community is the forum that currently is a phpBB2 forum.

Issues:
There is two major problems that we have encountered so far.
1. We have over 200 members and need to move the entire community without every single user have to create a new account or move every single post of in the forum.
2. We currently have a "match-signup" system for the BF site that needs to be integrated with the site.
3. Another feature that is commonly used is a DKP system (http://www.eqdkp.com) that we want integrated into the site to.

This is the list of things that is needed for the community, were point #1 and #4 is the most urgent. If anyone have any feedback or tips on how to this with Drupal, im all ears.

The community:
Here you can find links to the community, the majority of the content is in swedish:
http://www.nosurrender.nu
http://www.nosurrender.nu/forum
http://www.nosurrender.nu/dkp