hmm...
Thanx for the Metaboard....
Actually.... here, my faculties are asking for not using ready mate ICs and trying to do all from scratch!! :(.
and wifi, bluethooth or any RF etc are not in the scope of my project thats y i need a wired connection to my PC but not using readymate ICs 
but again one Addition to my project comes as i take a look on METABOARD!!!
Metaboard requires Atmega for simulating.
means in my board there will be one MCU for communication and other MCu which do the rest of the Application side processing...
means total 2 MCU on board!!!!!
hmm....if any other way possible to do cost cutting yet possible talking of MCU to PC, plz post it!!!!
Regards!!!
Hopes are HIGH!!!! == !LOW