Need Install of Devedit to CMS

I need a powerful wysiwyg editor to replace the one our CMS currentlty uses.. The one we have is outdated, and does not work in Firefox...so we need a new one, that will also have all the features such as devedit from Interspire (look it up on google) (we would be willing to buy the product above) if you can install this on our current setup. This should be "quick and easy..." More work to follow. We prefer US based developers/