Check out the job advertisments of the positions you want. Often they'll mention preferred certifications. I personally think that of the GSEC and GCIH, the GSEC is better but the GCIH has a better sounding name and implies that you're an "incident handler".
If you go to the
GIAC certification Roadmap, it has GSEC as the introductory, and GCIH as a higher level. So start with GSEC.
The DoD/military considers the Sec+ and GSEC to be the same, but you will get way, way, way more out of the GSEC class/cert than you will a Sec+.