start a small business or work for a company or work as a freelance

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or keep learning? Hello, I'm a student from china,I'm to graduate from Tongji University. It's time to choose what to do in the upcomming 2~3 years. I learn physics in Univerisy, duaring my college time I write lots of programs for different perpon. That's why I'm good at programming. I work as a freelancer at topcoder since 12-14-2006, the payment is very good. I got nearly $2000 pey month, in china it's really much money. If I work in China as a coder,it's very hard to get that good payment. Recently a classmate of me suggest me to write a program for balancing chemical equations. I think it useful for chemistry students, so I wrote the program "Intelli Balancer", later I make it a shareware. As it's useful, I want to promote it to all chemistry students. So you can see the choice for me: work as a freelance at topcoder, or get a job in China for about $500~700 per month, or keep working on my shareware. Which could be the best choice, or keep learning physics for a master degree? Thank you.