I didn't know if this was the right spot, let alone, the right forum, but I thought I would ask anyways.

How much would you be willinging to pay for a Site Managment System (SMS)?

It would have a content system, an ad system, a forum system, and it would all be managable from an online admin system.

How much would you pay for this? What other features would you want?

I am not sure as to what this system would include.

Are you saying it will give me the ability to admin a....

Forum
Banner Rotation (similar script)
HTML editor

The forum system would be a custom forum, comparable to vBulletin, the ad system would be a banner rotation with all the works, and the content system is a system where you can submit new content under multiple categories and then have it show up using one page by sending a ID number.

It would all be contained in a MySQL database and accessed through PHP pages.

The content management system is complete, but the forum and ad system are not, and I want to know whether to finish them or not based on if I could sell this sytem and if I could, what other features peopel would want.

To furthur clarify the content system, its not an HTML editor. You go to the admin page, click add content, then select and author and which categories the content should go in. Then you type in the content. The content can be formated with custom SMSCode which can do the stuff that normal HTML can do, but it also can split the content into multiple pages and is easier for non techies.

If I need to clarify this even more I will, just ask. :)

Have you heard of PhpNuke?

If you want this to be a big fast sysem then I suggest something other than MySQL such as PostgreSQL (Which is free now) as it is much faster than MySQL now. Take a look at http://www.phpbuilder.com you could even go one step better and use the PEAR DB abstraction layer to make it database independant.

As for features:

Forum (Has to be as good as vB)
Ad Rotator (As good as Ad-Cycle)
Good Template system (The one in vB is good) - Write it in XML and it would be even better.

On what basis are you stating that PostgreSQL is faster then mysql?