I have 2 totally different computers on my desk and I switch between them constantly using a KVM switch.
I have an Ubuntu desktop that I use for my "administrative" tasks - rdp, ssh, telnet, ftp, bittorrent, etc. And I have a MacBook Pro that I use for the rest of the stuff I have to do - IM, VMWare Fusion, etc. I browse from both & from my Windows VM depending what site I want to hit.
OSes & desktops are just tools to get the job done. You need to decide which one is best for you.