Macs in a PC workplace

Question

Here's the background.
I am a graphic artist just hired at an organization that uses PC with Windows XP for their computer platforms. Three other graphic artists are in my workgroup as well using the same setup. All of us have numerous years experience using Macs as that is the industry standard for creative work environments. The organization is a billion dollar company with several Global Business Units. I have been given the opportunity to put together a proposal for switching to Macs for our department.
Here's the problem.
I need to gather information to show why it would be a profitable move for the company to switch to Macs for the four graphic artists while everyone else works just fine on a HP Compaq. "There're freakin' awesome" isn't a viable reason. In fact, I need to show how they are more productive, work seamlessly with a Windows PC environment, it's industry standard for the type of work we do, etc.
Here's the question.
Where do I go to gather this information? Could anyone recommend someone who deals with this sort of thing? Any help would be greatly appreciated. Also, if there is a better place to post this, I'd appreciate you letting me know.

Answer 1

Not at the moment. But, I do have a friend who can walk me through it. Unfortunately, he works for a competitor and isn't able to come on site and help us out.
To be honest, I think that's a step further down the road. Right now, I just need resources that can help me sell the idea to the powers that be. I need things like "using a Mac will save X amount of time over using a PC because...". Never mind that the industry standard in computer platforms for creative work groups is a Mac.