I think 1100USD would be a very good price vor an NIB Avante. I also have seen the auction you mention on ebay, very expensive for 2800USD but probably someone will definatley buy, if not you can try again for 2000USD later for 1500USD etc......
Bye the way I am looking for a c-tree because I bought an used Avante2001 with an damaged rear upright Part number C3.