The 8650 cost Rs.16,500. The 9650 cost 17,800. But in my opinion, and apart from the grand that you save, the 8650 is better as it's got a bigger and a clearer display. Both are the slide down types and there is no difference at all in their configuration. These two are also different in the respect that they have the Burr Brown converter, which is world famous and which greatly increases your quality of output. More information on them:
http://www.pioneerelectronics.com