Rather than bothering to rewite an article thats already been written exactly how I would have written it I thought I would simply provide a link!
http://www.underworldmagazines.com/how-can-you-bridge-the-designer-developer-gap/
Enjoy 😀
Still not sure how to keep the costs down though without having to employ both a designer and a developer, plus you really need someone to manage them both and keep them on track and in alignment. This is something I can do for you if you happen to have a desinger and a developer, but dont know how to talk to them and manage them!