Paradox i have sent you a Email to respond. But to answer your question as simply as possible. CAD will be your best bet. The other design applications out there just do not compare. You can get complex with Photoshop and all that it offers but it still pales in comparison to CAD.
Sorry for the mis-communication. I was not trying to be sarcastic or acting Elite in any way. That is not my way. I jsut try to provide the best possible answer for a given question.