i'm not as familiar with the stove itself as many other members are. However, I would say for $1000 it better be lightly used and in excellent condition. I can buy a vigilant from local hvac suppliers (not stove shops) for 1300 new - this is the price for anyone that walks through the door, not some wholesale etc. discount. I personally wouldn't pay more than 700 for a used Vigilant in good condition, but that may be just me.
on edit: i see you're in alaska, this may change things. the prices may well be much higher (I used to live in sitka, and believe me, prices for everything were much higher), and in that situation, i wouldn't necessarily say that 1000 for a used stove is too much, it may be a good deal.