Help with career?

I am a 21 year old indian guy completing my graduation in june 2009. My graduation is in computers. I have great marks in graduation but my college is not that well known. Here in India, it takes a good college name, atleast initially to get a good job. I have a joob in hand at Siemens Informations Systems. Should I go for this job or go for higher education. I do want to learn more and gain expertise in a particular field. On the other hand, after studying for 21 years, I am eager to earn as well. I am awfully confused.

Any help will be appreciated, thnx :)