Well for any who are interested, I bought a 455 today. The one at the JD dealer in Columbia was in pretty good condition, with 592 hours on the meter. It was a trade in from a guy who bought a zero turn mower, and evidently he did his own maintenance, as JD didn't have any records on it, but they knew the guy who traded it. It was serviced before the trade, but needed new blades, and the cutting height adjustment knob was stuck in a narrow range, so the dealer is going to fix the height adjuster and put new blades on the cutter. The belts on the cutter are new as well. The paint and plastic have a few dings, scratches and rubs-not dents, and the hood has small cracks in the front corners, but opens and closes normally. The biggest negative on the tractor is the 60" cutter has alot of scratches and surface rust, and the turf tires are old, and probably need replacing. It also needs a bath, especially the engine compartment. I drove it around and cut a portion of the dealers lawn to see how it ran, and I was impressed at the power that it had and how smooth it cut. The power steering and spring cushioned seat were very comfortable. All in all I think I did OK. I paid $4000+tax for it, and hopefully will never have to buy another lawnmower in my lifetime. So all of you guys who convinced me to get the 455, chime in on what to be looking for maintenance wise and anything else you can think of. Thanks.