I have MAC's at home, and I work in IT too.
I run a Macbook Air 13" and run a Windows 7 Virtual machine on it. Interestingly, the battery on the Air, runs about 10-11 hours, but as soon as I crank up Win7, 3 hours max.
I have iMac 27" on the bench at home, my wife, daughter and youngest all have Macbook Pro laptops (love scholarship funds).
For backups, I run an Ubuntu server with 8 TB of capacity and Time Machine runs well.
As has been said before, Mac just work. Yes, there will be issues with some Windows based things like Excel macros, as they can be Visual Basic scripts. There MUST be a way to do it..... There is with everything else....
Love my Macs.