[QUOTE=ScubaDude;14063436]While you may never need high ISO, how can it be a bad thing if it has it, just in case? And, a dollar spent on noise reduction software is worth $10 spent on a camera (from a purely noise perspective). Here's a shot I just took of my dog at [expanded] ISO 12,800 with my humble T1i, followed by a 100% crop.
Sure, you wouldn't want to use that light/those settings if you were shooting the Queen's official portrait, but it'll do for a web-sized image or a casual snapshot if you spend a few minutes in post. Beats no shot at all./quote]
Let's twist that around. Why use the extreme ISO's when theres absolutely no need?