I have a client who I need a custom CMS for. I figure I will be able to resell the script so I was wondering how much this would cost to create. I have been looking for a script like this (and open realty wont work). So I have decided to get my own that my clientele would like. Here are the main features needed:

-Written in any language (but probably PHP)
-Targeted to a real estate agent audience
-Extremely simple to use
-CSS integrable, with an option to change the template from within the CMS (so I can easily make templates)
-Code up to standards (either XHTML or HTML 4.01)

What I would like this script to do:

-an integrated WYSIWYG
-Upload/edit/delete listing pages (with pictures and text)
-add pages (bio page etc)
-integrate IDX (basically a page that a frame will be in)
-be able to pick a feature property for main page?
-add links to menu



That's about it. Something very easy to use that's also very powerful. How much would I be looking at for this? I would not be looking for the cheapest person by the way, but someone that showed me work that was of good quality.

Sorry, but we cannot discuss pricing here at sitepoint.