This green card thing for the STEM people always floats around the Congress and does not happen for real. There is certainly immigration reform going to happen within a year but that targets mostly the illegal immigrants rather than people with legal status. It's good to hear the you got nice job with the bachelor's degree. However with that degree, you will always be working as junior to many people. Hence, if I were in your shoes, I would continue to work with the present company for about 1-2 year and go to the graduate school thereafter. This way you will save some money and will  gather the experience for the graduate studies also. 
Goodluck