That's a beautiful tank with an attractive stand and canopy. The lighting is nothing special, as the tank is very tall, and I assume the seller didn't specify what brand and model of canister filters are included. That would impact to an extent what I would be willing to offer. Then again, I see that you're located in Montana, and my experience is that used tanks are much more expensive if you're outside of a major metropolitan area. I'm not sure why, maybe it's the lack of competition. I agree with star rider that the person shouldn't expect to make a significant portion of the money back that was invested into the setup, but at the same time I see insane Craigslist deals in California that I would never see around here.
What is the seller's asking price?