Addonsync2009 is the way of the future i have added it to my server. soon you will not have to worry about wich addons you want as it allows you to down load the addons needed to play on that server i suggest to you and any one else that reads this try addonsync2009 no mission is unplayable and as a client all you need is to install and sync with server. this software at the moment is still only on 50 or so servers but as more server see the up side to this then i imagine it will take off.
To Mission editors: With this installed no mission will be unplayable due to the ammount of addons needed to play if your server is running a custom map this is your ticket to a full server.hope this helps
http://www.armaholic.com/page.php?id=8219