I recently purchased a Macbook Pro. It was the first time that I have ever bought an apple product, but I have used them over the years. I, like many converts to Macs, am thrilled with the choice. In my opinion, they make life altering technologies. Perhaps a little too much hyperbole, but that's how I feel.
I went with the Pro because I figured that even though I only travel once or twice a year, my vacations tend to be 4 weeks long or more. I knew I couldn't live without it.
If you do go with the Imac, and I agree that is probably what you need, definately spring for the extra bucks and get the best graphics card. When I looked at them, I assumed that as a "big serious grown-up" I wouldn't need to worry about that. Then I found the 3D virtual world Second Life......
Yeah, a fast graphics card will become more and more important I suspect.
How exciting for you! I hope you have a great time with your new Mac!