Useful Rich Text Editor

I am completely recoding my website and also planning to have a rich text composing feature. This means that I need to construct a rich text editor to make it all happen.

I have tried coding rich text editors and I know how they work, but when it comes down to browser compatibility (to some extent) and user interactivity, I fall behind.

Therefore I need to use a Rich Text Editor that is commercial, but is customizable and can be embedded easily into a website. Also if possible, some security features (outside HTML pasting, text limits, etc...).

Any ideas?

http://tinymce.moxiecode.com/

tinymce has free license version, but it is full feature and easily configured.
read some richtext editor reviews.

looks good, the only thing that I need to figure out how I can prevent outside HTML codes from being submitted to my website. For example, when someone puts an Iframe into a forum blog and then it messes up the entire page.

Obviously I need to check the posted data w/ PHP. I will ask in the PHP forum then.