I'm considering installing a Linux system (probably Red Hat)
Then that would be either Fedora Core, cAos, RHEL or CentOS. RHL is obsolete and should not be used.
That said, becasue the Linux community (especially workstations) is so small, it's not often the target of mallicous attacks on a user level.
With all due respect, but that's not the reason.
Keep ssh turned off unless you need it.
Better harden SSH instead.
Don't setup a web or ftp server on your workstation unless you need it.
Don't run any publicly available services at all. The only services you need are those necessary to support local processes.
Follow those rules & you should be about as secure as you can be.
I still think you're missing some. While it may seem a bit unwieldy at first glance have a look at the LQ FAQ: Security references
, post #1.