Sounds like a very good deal. After 15 years in the business as a weekend warrior, I'd get it (actually, I'm looking around for a good deal on a 12 inch too). However, I'm not planning to use it as my work horse. It will be a backup for those big jobs (especially pine as stated by others). the little 25 HP 6 inch will still remain my go-to chipper. Before u pull the trigger, u need to under stand the facts:
1. the 250 is a over 6000 LB. cannot be removed manually like a 6" one.
2. maintainance! A LOT more and harder to do. If u r very handy and have plenty time to do that, fine. I never do since I fill almost all my free time doing tree work (making money).
3. If u r getting a 2000 year model with only 2000 hours for $8500, and u can be reasonably sure that there is no major flaws (like engine, etc) that's heck a deal. Let's hope that u don't need to put 3, 4 grand into it soon.
if u can live with those facts then go for it. I don't mean to spoil ur excitement. Just speaking from my 15 year experience with the same business model as yours.