Bitbyte, I would see your best asset to move ahead right now in the IT field to be your 10 years of experience. The <a href=”http://www.comptia.org/”> Comptia </a> certs especially the A+, N+ will round out a resume nicely. Obtaining your <a href=”http://www.cisco.com/web/learning/le3/le2/le0/le9/learning_certification_type_home.html”>Cisco </a> certs, would also help. There are many resources to help you get your Cisco from places like <a href=”http://www.ciscocert.net/”>This </a> and <a href=”http://www.certforums.co.uk/forums/f15-cisco-certification-forums.html”>This </a>
Since you are a Linux/Windows admin certs for those OSs will probably be the best ones for you to look towards. On the Windows site you’ll want to look towards the <a href=”http://www.microsoft.com/learning/mcp/mcse/windows2003/default.mspx”>MCSE</a> for Windows 2003 or the <a href=”http://www.microsoft.com/learning/mcp/mcitp/default.mspx”>MCITP</a> for Windows 2008. Most Linux distros have certifications from the vendors. There are also general Linux certifications such as the <a href=”http://certification.comptia.org/linux/”>Linux+</a> certification from Comptia.
I wouldn’t recommend recommend Cisco certs for you unless you work with Cisco gear on a regular basis, or unless you want to move into networking.