I just purchased the same. My research indicated that it was a entry level baby grand from Young Chang starting in '96 and sometime through the early 2000's. There is not much information on this Bergmann series available.
I found that the price these were purchased for was probably between %5000 and $6000. Considering that it is a very entry level piano without a known name and little information available, I believed that something under 50% was a price point for this depending on the condition, play, etc.
The one we found (see post just down a bit on the forum) was in like-new condition. There is not anything super exciting about it other than it is a "grand" and much newer. It sounds far better than the 60 year old spinet that we had but by no means is it a great piano. It is a stepping stone piano for us. I would not have purchased it with a mind to keep it for a long time unless it is just a piece of furniture, then the play and sound does not matter much.
I think it represented a good value. We purchased ours for $1,800. I probably would have paid up to $2,200 so that my total out of pocket was $2,500 with moving. Anything more than that and I was too concerned with any issues it might have and if I would loose alot of value.
My research saw many of these across the US posted for between $3000 and $5000 in the used market. Personally, I think all of those prices were too high. Link to the info on the one I purchased