I'm a newbie to FreeBSD (or any Unix like OS) and currently setting up a desktop. My hardware is: Dual Xeon E5405 Quads, 16GB Mem, Areca 12xx, 4TB Raid 5, DVD burner, Quadro NVS 290 and LCD 1680 x 1050 display. Is there any advantage or disadvantage in the selection of 32 bit or 64 bit OS versions?