When I bought my tractor new... there was an older model of the same tractor I bought for sale on tractorhouse. It was about 6 years old, had over 900 hours and it was selling for the same exact price I paid for mine new. It's pretty crazy... you see 10-20 year old tractors that don't sell for much less than what new ones cost. Sounds like you did good on your sale.
Have fun with the new tractor!!