Please Recommend Online Shooter.

Hi Folks:

    I've been enjoying Delta force 2 online for many years.
It seems to be a pretty good match for my 600MHz Pentium 3.

    Now I've got an AMD 3800 X2.  This isn't the hottest
machine by today's standards, but I'm hoping it will let
me try some more graphically interesting first person
shooters.

    What do you folks recommend?  I'm looking for something
that has a good community, with online at no additional
charge, and gets with the program.  I like the capture the
flag and attack-defend DF2 missions.  In fact I just like
DF2, and would like to look at some more interesting
graphics.  Perhaps different uniforms for each team would
be nice.

    Suggestions?

                                                   Thanks
                                                   Larry