I have the 995, and I like it a lot. The main difference was flash location. On the 990, the flash is right next to the lens. They moved it up onto the camera on the 995. The 990 has been discontinued and replaced (2x) so I hope you are getting a good deal on one. If you are willing to deal with a rebate, you can get the current version (4500) for $450 after a $200 Mail in Rebate at
http://www.bhphoto.com