Which logs to logrotate?

Hi all

We've had new servers coming in and one of the requirement was to keep logs for up to 8 months. I know logrotate can do the job, but by default (on Suse Enterprise10, 11) we have these logs in /etc/logrotate.d dir as default logs which are rotated:

-rw-r--r-- 1 root root  140 Jul 23  2004 xdm
-rw-r--r-- 1 root root  134 Feb 21  2009 wtmp
-rw-r--r-- 1 root root  129 Feb 24  2009 scpm
-rw-r--r-- 1 root root  137 Apr 23  2010 zypp-history.lr
-rw-r--r-- 1 root root  200 May  5  2010 xinetd
-rw-r--r-- 1 root root 1337 May  5  2010 syslog
-rw-r--r-- 1 root root  225 May  5  2010 openslp-server
-rw-r--r-- 1 root root  187 May  8  2010 ntp
-rw-r--r-- 1 root root  289 May  8  2010 samba
-rw-r--r-- 1 root root  134 May  9  2010 zypper.lr
-rw-r--r-- 1 root root  139 May  9  2010 zypp-refresh.lr
-rw-r--r-- 1 root root  141 May 12  2010 rsync

Any idea on which additional logs are worth keeping for a long period of time (for audit and user logins & security purposes)? Part of the requirement were for access log but as I checked on the server, there's no access_log or access.log. (I did a find, and a whereis)

thank you..appreciate your inputs