I faced that decision about a year ago. I went with an iMac and an iPhone (for internet access away from home - I would carry my office laptop if I was ever traveling on business). I'm running the Office applications on the MAC OS X - not using Boot Camp - and while it took a little getting used to, I have never looked back.

Since I lost a lot of data when my last laptop crashed, I really appreciate how easy it is to configure and use the back-up system on the Macs. I'm using a Time Capsule which also creates my wireless network in the house for playing iTunes through wireless speakers connected through AirPort.

Regards,
Rex.