Apple iMac Core 2 Duo (17-inch, 1.83GHz)

Pros: slick, powerful, fast, stable

Cons: CD access a little awkward, and could use ...a handle?

Summary: Out of the box and up and running in a couple of minutes. Mac's touted stability is no longer a myth; it is. Very. Getting familiar with the menus will be a slight challenge to PC-ers. And the iMac used to come with Claris Works (now Apple Works) installed, but alas, no longer. A trial version of Pages is installed, though. I ordered Apple Works and will use it untill more goodies are added to iWork.
The machine is what I would like to call a "Semi- Portable", were it not for a lack of a handle, it's that compact. I love Airport, it's main wireless interface.
It comes equipped with a beta of BootCamp for using Windows OS, but I bought Parllells, and use it instead. Comparing WinXP running along with Mac OSX is very enlightening: Mac OSx is incredibly stable in comparison. The iMac "just does it", while XP constantly wiggles and waggles on the screen.
If you're thinking of switching, and still want to keep your Widows software, then iMac is the way to go.