6000 is the X11 ( X Window System) TCP port, so that an X client running on the network can use the services offered by your X server. If you remove it, you will no longer be able to use a GUI. You can pass it the --nolisten-tcp option to turn off the X TCP listener.
run
Code:
rpm -q --whatprovides <packagename-here>
to find the rpm packages you need.
The rest of the services you mentioned can be safely turned off. I would let them stay if I wasn't desperate about disk usage. Maybe later on.. if you feel like turning on one of those, they'll come in handy.
HTH