Hi
Very interesting question, so let me ask you one thing among all those technologies you mention what are you most interested in?
Cisco have line of tracks available
VOIP
SECURITY
DESIGN
ISP
ENTERPRISE
What are you most interested in? you are only 3 certificates away in Cisco to be set for life. I.E CCNA, CCNP AND CCIE (But make no mistake after CCNA you need at leaset year of experience {not required but very helpfull} to do CCNP and then you defiantly need 2 or 3 years of experience to pursue CCIE. CCIE is the most hallenging exam there is to write, passing rate is 7%.Go to cisco.com for more inquiry.
For Linux you need to decide what flavor you are interested in right now RHCT and RHCE are very hot.
Security is whole other trend if i would you and want to peruse the security track i would do secuirty + , CISSP and then Certified hacker.
Remember this is lot of work to do and you have to be very motivate. let me know if you have any questions
Khurram Mateen
CCNA,CCNP,CCDA,CCDP,CCIP,CCSP,VCP,MCSE (SECUIRTY,MESSAGING AND 2003) RHCT,RHCE,JN-CIA
p.s it took me more than 3 years to get these certificates and currently i am perusing my CCIE (passed written exam) waiting for lab exam.
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Keeping above answer in mind, my suggestion is dont go for so many certifications in one go or at the same time, decide on a path of your choice and ecel in that - may be network architecture and security would be a good choice.