If you want to get into security as a career, there are quite a few ways in. I'd recommend a security career - it's always interesting work, and you get to deal with almost all aspects of IT, from mainframes to Wireless Application Protocol devices. And demand is high, which means job offers and high salaries are easy to find. The first thing to do is decide what sort of job you're looking for - technical, consulting or management. It all depends on what suits you best.
Technical positions command good salaries.
If you get training in a security tool that's in demand, you'll soon have plenty of companies competing for your services. If you're a mainframe engineer, try mainframe security administration products like IBM's Resource Access Control Facility. There are quite a few products that seem to be in demand at the moment. Firewalls are a case in point. Most companies have a firewall, and Check Point has a very large market share.