Sorry to tell ya Houston, But $800 for a speaker isn't much. My lil single 15's retailed for more than $1,500 a cab.
a computer that is rack mountable,come on now Canute.
Most rackmount computer cases are way too long for the case that I already own. They are designed for server racks, not shallow DJ racks. I have found a few special shorter cases but they are typically pretty expensive and I already had this laying around.
Why build it? I enjoy building stuff and it's too cold to work on my Jeep project in the garage ;-)