Forsty, Oh yes the JD 450 is a great dozer. The size and power is just right. One thing I really like about it is the number of people who know about them and can give some advice about them. One farmer just down the road had one that is the same year as mine, it is nice to be able to just go down the road and get some fisthand advice. Also I can go down tho the local JD farm shop and pick up most all parts for the standard maintance. If I had to go to the heavy equipment company to pick up filters it would be a 130 mile round trip.
My 450 does have the winch on it, I have not used it much. The control cable is missed up, and have not had time to check it all the way out. The tranny on the JD450C is a good one and easy to use, with 4 forward/rev gear ranges, and auto high-low-rev in each gear. Very easy to use and dependable.
You can get a used JD450C from about $8000 to about 20,000, a good one would run 15,000 to 18,000. You really need to know what to look for when buying. You can get a 10k machaine and drop a 5-10k very fast on the undercarriage and drives.