I have seen 575's listed for less in very good condition. If your not in a hurry keep looking around or try to negotiate the price a little more Should be able to find a good one in the $9k range. I paid $7500 for my 575 with 72 thrower 8 years ago. The only problems I have had with it was with the thrower and RickB helped me finally figure out what was wrong. Someone "repaired" it before I bought it and didn't do it properly and it kept causing failures. Since Rick told me what was the problem it has not failed me since. The baler has ran great. The first year was a learning experience but since then I've been extremely happy with it.
Was your issue with the flywheel breaking off?
A friend of mine bought a NH with the 72 a couple of years ago and that happened. We had the dealer rebuild the upper belt assembly and it happened again after just a couple of hundred bales. This time the side plates twisted and sucked into the roller.
If this was your issue how did you solve it?
In his case I rebuilt it the 2nd time and had a friend of mine mill the flywheel for a taper lock bushing. I also added some spacers between the roller and the side plates. So far so good, but who knows long term. To me it's a poor design that they neck the roller shaft down where the flywheel mounts. They should have left the shaft the full dia and used a better system than 2 set screws to hold the flywheel on.