BoT

when did your CCNA expire? if it is more then 2 years from expiration then i would certainly renew/ retake it.
yes it is pointless to take the Net+ after the CCNA because the Net+ basically covers the first portion of the CCNA. so it's good to get some extra paper under your belt but you won't take much from it personally.
i would probably stick with the cisco route if you are really interested in networking