Hello, I wanted to purchase a used 2008 Mac Pro (with 4GB of RAM) and was wondering if anyone would recommend it for design work? I currently use the 2009 Mac Pro, and wasn't sure if downgrading my machine would make much of a difference. My main concern is speed, and the ability to have at least six different design programs open at once without any hiccups. Are there any designers out there who have experience working with this machine? Thanks!