As always, this depends on your choice of career paths. Are you more inclined to go the infrastructure route? Then CCNA may be your choice, since Cisco dominates this market. If auditing and pen testing is your goal, then CEH may be a better choice. Personally I would not go for GSEC, since it is more of an entry level security cert, and I think you're past this point.

The other thing to keep in mind is your choice of study methods. CEH can be done with the self study route, although playing in a lab with other students teaches you a lot. CCNA on the other hand is better done with hands on instruction. For this reason, boot camps are probably better. So then it's up to your (or your company's) budget.

As for ROI, I'd go Cisco.

Hope this helps,
Don

I agree with Don, a CCNA is a something you can't go wrong with. And you can renew by simply taking another Cisco test in any track. It will help somewhat with auditing & pentesting. The best way IMO for you to break into the security industry from tech support is networking. Try to join some area clubs like ISSA, Infragard, or various user groups. Those contacts are more valuable then any cert you can get. Use these contacts to get your foot in the door. If you find that there is a certain company you want to work for try to study that technology, whether its Cisco, Checkpoint, or whatever. Go in and do well on the interview and thats the best you can hope for. Contacts are like gold and never burn any bridges. Thats the best advice I can give you, cause I've learned the hard way.

Infragard is a FBI program thats free, but probably isn't in Canada. ISSA does have fees associated with it, but its not too much. I belong to a Snort Users Group which is cool and free.