Certifications by themselves are not going to get you a high salary. It is your ability to do the job and meet employer expectations and requirements. A certification may indicate you have met a certification body’s requirements but that alone will not get you a job. There has to be a fit with an organizations business needs.
So, it depends on where your interests and skills lie. If networking is your interest, then the Cisco series of certifications will be useful. If security is your vocation, look into the ISACA or ISC2 certifications. Cisco also has some security certifications focused on network security. Of course there are also operating system certifications like those from Microsoft or RedHat.
In the IT trenches? So am I – read my IT-Trenches blog.