Which post-graduate degree is best for a tech

Guys, I have a Bachelor’s degree in Business Studies and Computing Science and I am wondering which post-graduate degree to for for. I believe it depends on what one wants to do. Only problem is that I would like something that will become hot in future (not necessarily what’s hot now). I have been wondering over Ms in Electronic Commerce or even an MBA biased towards e-commerce. I am not sure which other routes may be interesting but I know that once you all give your suggestions I will be able to pick what suits me. Please help.