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[*]New forum rank and icon (see legend on board index, it's already there as "Premium Member").
[*]Access to private/exclusive forums.
[*]5 display name changes every 30 days (opposed to 2).
[*]Ability to open, close, and delete own topics; also able to delete own posts.
[*]Ability to store 200 personal messages (opposed to 50) and to include attachments.
[*]Ability to give up to 5 negative reputation points per day (opposed to 1), and 15 positive reputation points (opposed to 10). (this is dependent on whether or not we keep the "Like" system or revert to positive/negative rep)
[*]Ability to see who gave forum reputation.
[*]The satisfaction of helping out.
[/list]Obviously I'd like to add more. I've thought of adding the ability to add background images to user profiles, maybe skinning options for blogs. Download/Upload limits will definitely be higher when those systems are implemented. Abyways, Let me know if you have ideas.