Which path in my field is the right path to take?

I am vicky .I have completed BE(Electronics & telecom) ,Mumbai univ. I want to know which software technology will help me to pursue a good career.
I have following options
1.JAVA
2.VB .NET
3.LINUX, UNIX
4.SWT Testing
Do you know any other options related to my field.
Q:2 About JAVA : Can I learn Core Java at Home ?
Which part of advance Java will have more demand in market?
Which is better from future point of view JAVA OR VB .NET ?

If you want a guaranteed job in a big corporation, then you're safe with java or .net

Personally I code in Ruby and PHP which is a whole lot more fun :-)