I did the same in August this year, I bought a Macbook Pro (the small of them but with 200Gb 7200rpm and 4Gb of RAM), and I can tell you about my experience.
I'm a .NET developer and been ASP programmer for more than 10 years, so all I did was Microsoft related, never ever, aparat of installing and playing with Ubuntu, I had experience in the Linux world.
But my mind was on the iPhone SDK development and I even paid my inscription on the iPhone developer Program, all was lovely, I just loved my new Mac! But... Mac programming is a hobby for me, and believe me, Fusion, and even with my 4Gb and placed 2Gb for each OS, does not move as better as in a "normal" laptop, so after 4 month of struggling I formatted my laptop and created a Bootcamp partition (WOW, now I can use it for Windows!) and Fusion can run that Boot camp partition like a Virtual Machine image, and that is good for little times that I need to do something quick.
What you refer and as Uri mention, I don't thing that you know what you are going to do, having a "bunch" of apps in the laptop does say that, because, all you needed is Eclipse for everything else and XCode 3.1 with the SDK for Mac related apps, nothing more!
I was like you, but I realized that I didn't open any other programs that those 2, and except for compiling Objective-C code, was the Mac your better choice?
