Trending @Accenture; Salary negotiation

I have 5.4 YOE (level 10) in SAP MM. Worked in both ECC and S4. Been part of both Support and Deployment. I even know SAP SD as well as my secondary skill. Know basics of it. My Fixed is only 7.9 LPA. I definitely know that this is way below than what I should be earning. After November, I will start attending Interviews. I want to know, how much should I negotiate for? I mean, I will be very disappointed if the companies deny providing me what I deserve for my level just because my previous CTC is very less. Any suggestions or advice will be greatly appreciated. Also please suggest some best companies to work that in my domain.