Penetration Tester, Network Security Specialist or Computer Forensics

[infolookup () gmail com]

Hey all,

Since this is a security related list I figure what better place to ask this question. I am a student about to finish 
my undergrad in computer systems next semester, and I am thinking of a field that I would like to explore as a masters 
and even a career. These are a few that I know I am thinking of:
 1-   Penetration Tester
 2- Network Security Specialist 
 3- Computer Forensics

The main questions here are does anyone do any of these as a full time job and if so how are the market place for these 
jobs, or what path did you take to get there.

Thanks in advance.
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