For months now I've been considering a used Mac Pro, but they hold their prices so well it doesn't make much sense to me. At the high end of that range, $1500 for a 2006 Mac Pro is crazy. You can get a new 2009 Mac Pro for about $1900. The extra $400 gets you a new Mac instead of a used one, a warranty, a better keyboard, a better case, much better graphics, almost twice as high a Geekbench score, bigger HD, faster memory, faster CPU, newer socket, Hypertransport instead of a FSB, twice the cache, 64-bit EFI instead of 32, a better upgrade path for video cards, 2.1 bluetooth... did I miss anything? That's a phenomenal advantage for only $400 more.