The highest salary I found for a Nepal was for a Surgeon with 410,000/yr.
http://visadoor.com/greencards-2012-A-12185-79099/surgeons-the-aroostook-medical-center

For IT field, I found 161,012.8/yr.
http://visadoor.com/greencards-2010-A-10224-13373/computer-and-information-systems-manager-horizon-computer-services-inc

Most people in IT seem to be paid under 100K, even in major cities - which was pretty surprising.