Hallo Raghunathan,

yes, I now. I needed about 2 weeks for having it all read (and some more for understanding and believing, hoho...).

Grounding is a hard bred. Working with symmetrical signals is not so complicated as one might think. What's needed is instrumentation amplifier, but NOT neccessarily expensive instrumentation amplifier chips. If you can live with some decreased level of common mode rejection ratio costs can be extremely low. It's not the chip what makes symmetrical routing so superior, it's just principle of working. And it can be implemented quite easy. For people working with that stuff all day long building an instrumenation amplifier is really quite easy. It only needs some experience.
In the next days I try to send you just a simple layout. I don't know whether it is your daily work to implement such circuit on actual PCB, but when you need help for developing some circuit it will be a pleasure for me to give you some hints. Just contact me under my e-mail address.

Bye,
Kai