I've chosen immigration.com (Rajiv S. Khanna) for my GC processing.
I've got excellent response from them for all the phases of my GC. The documentation they prepare for the GC processing is very organized and 2nd to none.
Special thanks to my case manager Amrita. Amrita was answering all my questions right from the day 1 of my GC process. Her response to my emails/voice messages was immediate.
Thanks also to Rita for preparing the documentation for I-140 processing.
I've referred Rajiv Khanna to many HR folks in financial and IT companies. After my success many of my friends are willing to start/transfer their GC processing to Mr.Khanna's office.