Huge thanks to everyone for chipping in advice and comments.
How's this for a story: Somehow I think this body was meant for me - first thing when I woke up on Saturday morning was get on Craigslist and start looking for a body, I spot the 1Ds and immediately email the seller asking to come over and see it. 5min later our electricity went out and I couldn't get back online to check my email! I started to panic, but wait, I call up my buddy and tell him to look up the same ad and give me the guy's phone # which was also posted in the ad. I call up the guy and I rush over to his house @ warp 11 and spent the next 3.5hrs having a ball over there.
This was my first experience with a 1D body and when I went to go pick it up I felt like I was picking up a stack of workout weights. I couldn't believe how solid and heavy the thing was, and that was without any lens attached! Fortunately the seller had a wide selection of lenses to try on and I spot a 70-200IS II, instant saliva form around the corner of my mouth. I felt like a cyborg limping around with such a massive and overweight piece of metal gear, hand shooting everything in sight.
Long story short we also took some sample shots with a 50 1.4 and I did some test shots in the garage and inside the house, where there is low light. I had the seller close his garage door and turn on a spot lamp that was pointed the opposite direction while I took some more pictures. I needed to make sure that the low light performance is up to my standards. Everything looked great and I realize that there's much needed practice with a gem like this, but the pictures on the computer were very satisfying already, can't imagine how much better it would be.
The condition of the body is amazing, I'd say 8.5/10. All the LCD screens were without a scratch and the body was still very grippy. Came with original box, neck strap, 2 batteries, dual battery charger and the rest of the usual papers, manual, etc. But it was missing the hand strap and one of the cable/cord.
edit: Oh and the shutter sound that everyone talks about, it's 1000% true, absolutely glorious.