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,
CISSP, MCSE, CSTA, Security+ SME