I have an old Imac DV (400MHZ) with Final Cut Pro 3 installed on it. As you all know, FCP is a professional editing program that many movies (not just ski movies, but TV shows and holly wood movies) are edited with. The computer runs a bit slow, but it gets the job done every time.
$300, I live in MN, but will be in Vancouver this winter. FCP alone was $1000, and you couldnt buy just the FCP softwear for near this cheap.
PS-this computer also has microsoft word and runs OSX and OS9, also a great work computer.