Don't know if you came across these yet. I used to own a site with webscribble's script on it. It was okay. Might be able to tweek it and make it better. The second one I came across later and liked but have not tried it out. Relationship will build a site for you and all you have to do is promote it but they want like 5K up front. If you want a co-brand I use iwantu.
http://dotnetdating.com/default.aspx?group_id=2
http://webscribble.com/products/webdate/index.shtml
http://www.relationshipexchange.com/index.cfm