Firstly, I didn't mention Windows, but I'm glad you could get your rant off your chest. Although you basically did just say "Windows is never used unless it is".
Secondly the performance comment was about games and is completely true. You get more for your money, i.e $2,500 buys you a much faster gaming system than the base Mac Pro; and a Mac Pro can't ever offer as much gaming performance as you can't over-clock it or use as many graphics cards as you can with other boards.
Yes apparently for day trading you need six monitors, So I built it for him.
Pentium i7 3.4 GHz 2600k CPU
16GB RAM
Bluetooth, Firewire, USB 3.0, eSATA, SATA 6 SSD HD& SATA 6 non SSD HD, DVD burner. It came out really nice.